Merge pull request 'feat(frontend): sidebar colapsable por secciones + fly-out en modo colapsado' (#62) from chore/sidebar-collapsible-sections into main

Mejora UX post-refactor (PR #61): las 4 secciones del sidebar expandido son
ahora colapsables individualmente, y el modo colapsado reemplaza la lista
larga de iconos por un icono por grupo con fly-out panel on hover.

Expandido (240px):
- Click en header de sección (Seguridad/Maestros/Catálogo/Tasación) toggle
  collapse con chevron que rota.
- Default: todas colapsadas EXCEPTO la que contiene la ruta activa
  (auto-expand override).
- Sección activa tiene el header disabled + sin chevron (no se puede colapsar
  mientras estás ahí — evita esconder items de la ruta actual).
- Preferencia per-sección persistida en localStorage.

Colapsado (68px):
- Un icono por grupo en lugar de listar TODOS los items (evitando scroll
  largo en usuarios con muchos permisos).
- Hover sobre el grupo despliega un fly-out panel al lado derecho con el
  título del grupo + sus items clickeables.
- Grupo que contiene la ruta activa tiene un dot indicator.
- Icons de grupo: ShieldCheck (Seguridad), Building2 (Maestros),
  Package (Catálogo), Calculator (Tasación).

Accessibility:
- Headers expandidos: aria-expanded refleja estado.
- Fly-out: aria-haspopup='menu' + role='menu' + keyboard focus.

z-index management (pedido explícito del user):
- aside wrapper en ProtectedLayout: z-10 -> z-30 (sobre contenido).
- HoverCardContent del fly-out: z-[60] (sobre cualquier overlay app-level,
  excepto modal dialogs que siguen siendo z-50 por convención Radix).
- hover-card.tsx: envuelto en HoverCardPrimitive.Portal (faltaba en el
  shadcn generated) — previene que el fly-out quede cortado por overflow
  del aside.

Dependencies:
- shadcn hover-card agregado via 'npx shadcn@latest add' (+ @radix-ui/react-hover-card).

Tests:
- 16 tests (antes 10) — agregados 6 casos: default collapsed except active,
  click toggle expand/collapse, aria-expanded reflection, disabled header
  when active, root route collapses all, localStorage persistence.

README.md

@@ -73,6 +73,27 @@ dotnet test tests/SIGCM2.Api.Tests               # integration (requiere SIGCM2_
 cd src/web && npx vitest run
 ```
 
+### Coverage (backend)
+
+```bash
+# Generar reporte de coverage en formato Cobertura
+dotnet test --collect:"XPlat Code Coverage" --settings coverlet.runsettings --results-directory ./TestResults
+```
+
+El comando genera un `coverage.cobertura.xml` por cada proyecto de test en `./TestResults/`.
+
+Para convertirlo a HTML:
+
+```bash
+# Instalar ReportGenerator (solo la primera vez)
+dotnet tool install -g dotnet-reportgenerator-globaltool
+
+# Generar reporte HTML
+reportgenerator -reports:"./TestResults/**/coverage.cobertura.xml" -targetdir:"./coverage-report" -reporttypes:Html
+```
+
+Abrí `./coverage-report/index.html` en el browser para ver el detalle por archivo.
+
 ## Convenciones
 
 - Ramas: `feature/UDT-XXX` desde `main`.

coverlet.runsettings

@@ -0,0 +1,48 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RunSettings>
+  <!--
+    Configuracion de coverage con coverlet.collector.
+    Uso: dotnet test /collect:"XPlat Code Coverage" /settings:coverlet.runsettings /results-directory:./TestResults
+  -->
+  <RunConfiguration>
+    <!-- Mantener ejecución secuencial (hereda política de tests.runsettings) -->
+    <MaxCpuCount>1</MaxCpuCount>
+  </RunConfiguration>
+
+  <DataCollectionRunSettings>
+    <DataCollectors>
+      <DataCollector friendlyName="XPlat Code Coverage">
+        <Configuration>
+          <!-- Formato de salida: cobertura (compatible con ReportGenerator y CI/CD) -->
+          <Format>cobertura</Format>
+
+          <!-- Exclusiones por atributo generado -->
+          <ExcludeByAttribute>GeneratedCodeAttribute,ExcludeFromCodeCoverageAttribute</ExcludeByAttribute>
+
+          <!-- Exclusiones por tipo/namespace -->
+          <Exclude>
+            <!-- Migrations embebidas (SQL scripts, no lógica de negocio) -->
+            [*.Migrations]*,
+            <!-- Los proyectos de test no se miden a sí mismos -->
+            [*.Tests]*,
+            [SIGCM2.TestSupport]*,
+            <!-- Program.cs: host wiring, no testeable unitariamente -->
+            [SIGCM2.Api]Program,
+            <!-- Extension methods de DI: una línea por registro, ruido sin valor -->
+            [*]*.Extensions.*Extensions,
+            [*]*.DependencyInjection
+          </Exclude>
+
+          <!-- No medir las propiedades auto-implementadas -->
+          <SkipAutoProps>true</SkipAutoProps>
+
+          <!-- No incluir el assembly de tests en el reporte -->
+          <IncludeTestAssembly>false</IncludeTestAssembly>
+
+          <!-- Permitir timestamps reales en el reporte (no forzar determinismo) -->
+          <DeterministicReport>false</DeterministicReport>
+        </Configuration>
+      </DataCollector>
+    </DataCollectors>
+  </DataCollectionRunSettings>
+</RunSettings>

database/README.md

@@ -34,6 +34,14 @@ database/
 | V015 | `V015__create_local_timezone_views.sql` | UDT-011 | Vistas admin con OccurredAt convertido a hora Argentina |
 | **V016** | **`V016__create_rubro.sql`** | **CAT-001** | **Rubro (adjacency list, temporal 10y) + permiso `catalogo:rubros:gestionar`** |
 | **V017** | **`V017__create_product_type.sql`** | **PRD-001** | **ProductType (flags + multimedia limits, temporal 10y) + permiso `catalogo:tipos:gestionar`** |
+| V018 | `V018__create_product.sql` | PRD-002 | Product (temporal 10y) + permiso `catalogo:productos:gestionar` + índices |
+| V019 | `V019__create_product_prices.sql` | PRD-003 | ProductPrices (temporal 10y, forward-only) + SP `sp_ProductPrices_InsertWithClose` + permiso implícito |
+| V020 | `V020__add_chargeable_chars_permission.sql` | PRC-001 | Permiso `tasacion:caracteres_especiales:gestionar` + asignación a admin |
+| V021 | `V021__create_chargeable_char_config.sql` | PRC-001 | ChargeableCharConfig + ChargeableCharConfig_History (temporal 10y) + 2 SPs (`InsertWithClose`, `GetActiveForProductType`) + 2 índices |
+| V022 | `V022__seed_chargeable_char_config.sql` | PRC-001 | Seed 4 filas globales (`$`, `%`, `!`, `¡`) con PricePerUnit=1.0000 |
+| V023 | `V023__refactor_chargeable_char_config_to_product_type.sql` | PRC-001 (scope delta) | Refactor MedioId→ProductTypeId + nuevo SP `ReactivateWithGuard` + CK_Price_NonNegative (>= 0) |
+| V024 | `V024__reseed_global_with_zero_price.sql` | PRC-001 (scope delta) | Reseed 4 globales a PricePerUnit=0.0000 (opt-in billing) |
+| V025 | `V025__seed_chargeable_char_overrides_demo.sql` | PRC-001 (followup #54) | Seed demo de overrides ficticios per-ProductType (Clasificado/Notables/Fúnebres). Idempotente: no-op si los tipos no existen |
 
 ## Convenciones
 

database/migrations/V018_ROLLBACK.sql

@@ -0,0 +1,67 @@
+-- V018_ROLLBACK.sql
+-- Reversa de V018__create_product.sql — PRD-002.
+--
+-- Idempotente: cada paso usa IF EXISTS guards.
+-- ADVERTENCIA: Ejecutar antes de V017_ROLLBACK (FK desde Product hacia ProductType).
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- 1. SYSTEM_VERSIONING OFF
+IF EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.Product') AND temporal_type = 2)
+BEGIN
+    ALTER TABLE dbo.Product SET (SYSTEM_VERSIONING = OFF);
+    PRINT 'Product: SYSTEM_VERSIONING = OFF.';
+END
+GO
+
+-- 2. DROP PERIOD
+IF EXISTS (SELECT 1 FROM sys.periods WHERE object_id = OBJECT_ID('dbo.Product'))
+BEGIN
+    ALTER TABLE dbo.Product DROP PERIOD FOR SYSTEM_TIME;
+    PRINT 'Product: PERIOD FOR SYSTEM_TIME dropped.';
+END
+GO
+
+-- 3. Drop HIDDEN columns + default constraints
+IF COL_LENGTH('dbo.Product', 'ValidFrom') IS NOT NULL
+BEGIN
+    ALTER TABLE dbo.Product DROP CONSTRAINT IF EXISTS DF_Product_ValidFrom;
+    ALTER TABLE dbo.Product DROP CONSTRAINT IF EXISTS DF_Product_ValidTo;
+    ALTER TABLE dbo.Product DROP COLUMN ValidFrom, ValidTo;
+    PRINT 'Product: ValidFrom/ValidTo columns dropped.';
+END
+GO
+
+-- 4. Drop history
+IF OBJECT_ID(N'dbo.Product_History', N'U') IS NOT NULL
+BEGIN
+    DROP TABLE dbo.Product_History;
+    PRINT 'Table dbo.Product_History dropped.';
+END
+GO
+
+-- 5. Drop main
+IF OBJECT_ID(N'dbo.Product', N'U') IS NOT NULL
+BEGIN
+    DROP TABLE dbo.Product;
+    PRINT 'Table dbo.Product dropped.';
+END
+GO
+
+-- 6. Remove RolPermiso / Permiso
+DELETE rp FROM dbo.RolPermiso rp
+    JOIN dbo.Permiso p ON p.Id = rp.PermisoId
+    WHERE p.Codigo = 'catalogo:productos:gestionar';
+PRINT 'RolPermiso rows for catalogo:productos:gestionar deleted.';
+GO
+
+DELETE FROM dbo.Permiso WHERE Codigo = 'catalogo:productos:gestionar';
+PRINT 'Permiso catalogo:productos:gestionar deleted.';
+GO
+
+PRINT '';
+PRINT 'V018 rolled back successfully.';
+GO

database/migrations/V018__create_product.sql

@@ -0,0 +1,172 @@
+-- V018__create_product.sql
+-- PRD-002: Product — entidad vendible concreta del catálogo comercial.
+--
+-- Cambios:
+--   1. dbo.Product (FK Medio/ProductType/Rubro, SYSTEM_VERSIONING ON, retention 10 años).
+--   2. Índices: filtered UQ por (MedioId, ProductTypeId, Nombre) activos; cover por ProductTypeId
+--      (para IProductQueryRepository); cover por MedioId; cover filtrado por RubroId.
+--   3. Permiso 'catalogo:productos:gestionar' + asignación a rol 'admin'.
+--
+-- Patrón: V017 (dbo.ProductType con SYSTEM_VERSIONING + PAGE compression + MERGE permisos).
+-- Idempotente: seguro para re-ejecutar.
+-- Reversa: V018_ROLLBACK.sql.
+-- Run on: SIGCM2 (dev) y SIGCM2_Test (integration tests).
+--
+-- Notas:
+--   - SIN seed de datos — PRD-008 (V019) seedea los 12 productos legacy.
+--   - Validación de flags (RequiresCategory, HasDuration) vive en Application layer:
+--     un ProductType puede cambiar flags; la Product queda en estado snapshot.
+--   - UQ filtered WHERE IsActive=1: permite reusar nombres tras soft-delete.
+--
+-- SDD Design: engram sdd/prd-002-product-crud/design
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 1. dbo.Product
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF OBJECT_ID(N'dbo.Product', N'U') IS NULL
+BEGIN
+    CREATE TABLE dbo.Product (
+        Id                INT IDENTITY(1,1) NOT NULL CONSTRAINT PK_Product PRIMARY KEY,
+        Nombre            NVARCHAR(300)     COLLATE SQL_Latin1_General_CP1_CI_AI NOT NULL,
+        MedioId           INT               NOT NULL,
+        ProductTypeId     INT               NOT NULL,
+        RubroId           INT               NULL,
+        BasePrice         DECIMAL(18,4)     NOT NULL,
+        PriceDurationDays INT               NULL,
+        IsActive          BIT               NOT NULL CONSTRAINT DF_Product_IsActive         DEFAULT(1),
+        FechaCreacion     DATETIME2(3)      NOT NULL CONSTRAINT DF_Product_FechaCreacion    DEFAULT(SYSUTCDATETIME()),
+        FechaModificacion DATETIME2(3)      NULL,
+        CONSTRAINT FK_Product_Medio       FOREIGN KEY (MedioId)       REFERENCES dbo.Medio(Id)       ON DELETE NO ACTION,
+        CONSTRAINT FK_Product_ProductType FOREIGN KEY (ProductTypeId) REFERENCES dbo.ProductType(Id) ON DELETE NO ACTION,
+        CONSTRAINT FK_Product_Rubro       FOREIGN KEY (RubroId)       REFERENCES dbo.Rubro(Id)       ON DELETE NO ACTION,
+        CONSTRAINT CK_Product_BasePrice_NonNegative CHECK (BasePrice >= 0),
+        CONSTRAINT CK_Product_PriceDurationDays_Positive CHECK (PriceDurationDays IS NULL OR PriceDurationDays >= 1)
+    );
+    PRINT 'Table dbo.Product created.';
+END
+ELSE
+    PRINT 'Table dbo.Product already exists — skip.';
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 2. SYSTEM_VERSIONING — Product
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF COL_LENGTH('dbo.Product', 'ValidFrom') IS NULL
+BEGIN
+    ALTER TABLE dbo.Product
+    ADD
+        ValidFrom DATETIME2(3) GENERATED ALWAYS AS ROW START HIDDEN NOT NULL
+            CONSTRAINT DF_Product_ValidFrom DEFAULT(SYSUTCDATETIME()),
+        ValidTo   DATETIME2(3) GENERATED ALWAYS AS ROW END   HIDDEN NOT NULL
+            CONSTRAINT DF_Product_ValidTo   DEFAULT(CONVERT(DATETIME2(3), '9999-12-31 23:59:59.999')),
+        PERIOD FOR SYSTEM_TIME (ValidFrom, ValidTo);
+    PRINT 'Product: PERIOD FOR SYSTEM_TIME added.';
+END
+GO
+
+IF NOT EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.Product') AND temporal_type = 2)
+BEGIN
+    ALTER TABLE dbo.Product
+    SET (SYSTEM_VERSIONING = ON (
+        HISTORY_TABLE = dbo.Product_History,
+        HISTORY_RETENTION_PERIOD = 10 YEARS
+    ));
+    PRINT 'Product: SYSTEM_VERSIONING = ON (history: dbo.Product_History, retention: 10 years).';
+END
+ELSE
+    PRINT 'Product: SYSTEM_VERSIONING already ON — skip.';
+GO
+
+IF EXISTS (SELECT 1 FROM sys.tables WHERE name = 'Product_History' AND schema_id = SCHEMA_ID('dbo'))
+   AND NOT EXISTS (
+       SELECT 1 FROM sys.partitions p
+       JOIN sys.tables t ON t.object_id = p.object_id
+       WHERE t.name = 'Product_History' AND p.data_compression = 2
+   )
+BEGIN
+    ALTER TABLE dbo.Product_History REBUILD WITH (DATA_COMPRESSION = PAGE);
+    PRINT 'Product_History: rebuilt with PAGE compression.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 3. Índices
+-- ═══════════════════════════════════════════════════════════════════════
+
+-- Filtered UQ: unicidad activa por (Medio, Tipo, Nombre). Permite reusar nombres tras soft-delete.
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'UQ_Product_MedioId_ProductTypeId_Nombre_Active' AND object_id = OBJECT_ID('dbo.Product'))
+BEGIN
+    CREATE UNIQUE INDEX UQ_Product_MedioId_ProductTypeId_Nombre_Active
+        ON dbo.Product (MedioId, ProductTypeId, Nombre)
+        WHERE IsActive = 1;
+    PRINT 'Index UQ_Product_MedioId_ProductTypeId_Nombre_Active created.';
+END
+GO
+
+-- Cover para IProductQueryRepository.ExistsActiveByProductTypeAsync
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_Product_ProductTypeId_IsActive' AND object_id = OBJECT_ID('dbo.Product'))
+BEGIN
+    CREATE INDEX IX_Product_ProductTypeId_IsActive
+        ON dbo.Product (ProductTypeId, IsActive);
+    PRINT 'Index IX_Product_ProductTypeId_IsActive created.';
+END
+GO
+
+-- Cover para list filtered by MedioId
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_Product_MedioId_IsActive' AND object_id = OBJECT_ID('dbo.Product'))
+BEGIN
+    CREATE INDEX IX_Product_MedioId_IsActive
+        ON dbo.Product (MedioId, IsActive);
+    PRINT 'Index IX_Product_MedioId_IsActive created.';
+END
+GO
+
+-- Cover para list filtered by RubroId
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_Product_RubroId_IsActive' AND object_id = OBJECT_ID('dbo.Product'))
+BEGIN
+    CREATE INDEX IX_Product_RubroId_IsActive
+        ON dbo.Product (RubroId, IsActive)
+        WHERE RubroId IS NOT NULL;
+    PRINT 'Index IX_Product_RubroId_IsActive created.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 4. Permiso: catalogo:productos:gestionar + asignación a rol 'admin'
+-- ═══════════════════════════════════════════════════════════════════════
+
+MERGE dbo.Permiso AS t
+USING (VALUES
+    ('catalogo:productos:gestionar',
+     N'Gestionar productos del catálogo',
+     N'Crear, editar y desactivar productos del catálogo comercial',
+     'catalogo')
+) AS s (Codigo, Nombre, Descripcion, Modulo)
+ON t.Codigo = s.Codigo
+WHEN NOT MATCHED BY TARGET THEN
+    INSERT (Codigo, Nombre, Descripcion, Modulo)
+    VALUES (s.Codigo, s.Nombre, s.Descripcion, s.Modulo);
+GO
+
+MERGE dbo.RolPermiso AS t
+USING (
+    SELECT r.Id AS RolId, p.Id AS PermisoId
+    FROM (VALUES ('admin', 'catalogo:productos:gestionar')) AS x (RolCodigo, PermisoCodigo)
+    JOIN dbo.Rol     r ON r.Codigo = x.RolCodigo
+    JOIN dbo.Permiso p ON p.Codigo = x.PermisoCodigo
+) AS s ON t.RolId = s.RolId AND t.PermisoId = s.PermisoId
+WHEN NOT MATCHED BY TARGET THEN
+    INSERT (RolId, PermisoId) VALUES (s.RolId, s.PermisoId);
+GO
+
+PRINT '';
+PRINT 'V018 applied — dbo.Product (temporal, retention 10y) + permiso catalogo:productos:gestionar.';
+PRINT 'Next: V019 (PRD-008 — seed 12 productos legacy).';
+GO

database/migrations/V019_ROLLBACK.sql

@@ -0,0 +1,71 @@
+-- V019_ROLLBACK.sql
+-- PRD-003: Reversa de V019__create_product_prices.sql.
+--
+-- Pasos:
+--   1. Deshabilita SYSTEM_VERSIONING en dbo.ProductPrices (requerido antes de DROP TABLE).
+--   2. Elimina el PERIOD FOR SYSTEM_TIME y las columnas hidden SysStartTime/SysEndTime.
+--   3. Drop de dbo.ProductPrices_History.
+--   4. Drop de dbo.ProductPrices (y sus constraints + índices en cascada).
+--   5. Drop de dbo.usp_AddProductPrice.
+--
+-- ADVERTENCIA: destruye todo el historial de precios. Ejecutar sólo en DEV o TEST.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- 1. Deshabilita SYSTEM_VERSIONING (imprescindible antes de DROP TABLE temporal).
+IF EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.ProductPrices') AND temporal_type = 2)
+BEGIN
+    ALTER TABLE dbo.ProductPrices SET (SYSTEM_VERSIONING = OFF);
+    PRINT 'ProductPrices: SYSTEM_VERSIONING = OFF.';
+END
+GO
+
+-- 2. Elimina el PERIOD y las hidden cols (si existen, independientemente del versioning).
+IF COL_LENGTH('dbo.ProductPrices', 'SysStartTime') IS NOT NULL
+BEGIN
+    ALTER TABLE dbo.ProductPrices
+    DROP PERIOD FOR SYSTEM_TIME;
+
+    -- Drop default constraints antes de drop de columnas.
+    IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_ProductPrices_SysStartTime')
+        ALTER TABLE dbo.ProductPrices DROP CONSTRAINT DF_ProductPrices_SysStartTime;
+    IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_ProductPrices_SysEndTime')
+        ALTER TABLE dbo.ProductPrices DROP CONSTRAINT DF_ProductPrices_SysEndTime;
+
+    ALTER TABLE dbo.ProductPrices DROP COLUMN SysStartTime;
+    ALTER TABLE dbo.ProductPrices DROP COLUMN SysEndTime;
+    PRINT 'ProductPrices: PERIOD + hidden cols dropped.';
+END
+GO
+
+-- 3. Drop de la history table.
+IF OBJECT_ID(N'dbo.ProductPrices_History', N'U') IS NOT NULL
+BEGIN
+    DROP TABLE dbo.ProductPrices_History;
+    PRINT 'Table dbo.ProductPrices_History dropped.';
+END
+GO
+
+-- 4. Drop de la tabla principal (constraints + índices en cascada).
+IF OBJECT_ID(N'dbo.ProductPrices', N'U') IS NOT NULL
+BEGIN
+    DROP TABLE dbo.ProductPrices;
+    PRINT 'Table dbo.ProductPrices dropped.';
+END
+GO
+
+-- 5. Drop del SP.
+IF OBJECT_ID(N'dbo.usp_AddProductPrice', N'P') IS NOT NULL
+BEGIN
+    DROP PROCEDURE dbo.usp_AddProductPrice;
+    PRINT 'Procedure dbo.usp_AddProductPrice dropped.';
+END
+GO
+
+PRINT '';
+PRINT 'V019 rollback complete — dbo.ProductPrices, dbo.ProductPrices_History, dbo.usp_AddProductPrice removed.';
+GO

database/migrations/V019__create_product_prices.sql

@@ -0,0 +1,196 @@
+-- V019__create_product_prices.sql
+-- PRD-003: ProductPrices — historial de precios por Producto con vigencia civil (Cat2).
+--
+-- Cambios:
+--   1. dbo.ProductPrices (FK Product, SYSTEM_VERSIONING ON, retention 10 años).
+--   2. Índices: filtered UQ un único activo; cover compuesto para GetPriceAt.
+--   3. SP dbo.usp_AddProductPrice (SERIALIZABLE + UPDLOCK, cierre atómico forward-only).
+--
+-- Patrón: V018 (SYSTEM_VERSIONING + PAGE compression).
+-- Idempotente: seguro para re-ejecutar.
+-- Reversa: V019_ROLLBACK.sql.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+--
+-- Notas:
+--   - SysStartTime/SysEndTime como nombres de cols HIDDEN (no ValidFrom/ValidTo):
+--     evita colisión con las business cols PriceValidFrom/PriceValidTo (D1).
+--   - DECIMAL(12,2) para Price (distinto de Product.BasePrice DECIMAL(18,4)) — precios retail
+--     en pesos con 2 decimales; la diferencia es intencional (D6).
+--   - Sin seed inicial — Product.BasePrice queda ortogonal como fallback (OQ-B, D8).
+--   - Forward-only estricto en SP: THROW 50409 si new PVF <= active PVF (no solo <).
+--
+-- SDD Design: engram sdd/prd-003-product-prices-historicos/design
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 1. dbo.ProductPrices
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF OBJECT_ID(N'dbo.ProductPrices', N'U') IS NULL
+BEGIN
+    CREATE TABLE dbo.ProductPrices (
+        Id              BIGINT IDENTITY(1,1) NOT NULL
+            CONSTRAINT PK_ProductPrices PRIMARY KEY,
+        ProductId       INT           NOT NULL,
+        Price           DECIMAL(12,2) NOT NULL,
+        PriceValidFrom  DATE          NOT NULL,
+        PriceValidTo    DATE          NULL,
+        FechaCreacion   DATETIME2(3)  NOT NULL
+            CONSTRAINT DF_ProductPrices_FechaCreacion DEFAULT(SYSUTCDATETIME()),
+        CONSTRAINT FK_ProductPrices_Product
+            FOREIGN KEY (ProductId) REFERENCES dbo.Product(Id) ON DELETE NO ACTION,
+        CONSTRAINT CK_ProductPrices_Price_Positive
+            CHECK (Price > 0),
+        CONSTRAINT CK_ProductPrices_ValidRange
+            CHECK (PriceValidTo IS NULL OR PriceValidTo >= PriceValidFrom)
+    );
+    PRINT 'Table dbo.ProductPrices created.';
+END
+ELSE
+    PRINT 'Table dbo.ProductPrices already exists — skip.';
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 2. SYSTEM_VERSIONING — ProductPrices
+--    Las hidden cols se llaman SysStartTime/SysEndTime para evitar
+--    colisión con las business cols PriceValidFrom/PriceValidTo (D1).
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF COL_LENGTH('dbo.ProductPrices', 'SysStartTime') IS NULL
+BEGIN
+    ALTER TABLE dbo.ProductPrices
+    ADD
+        SysStartTime DATETIME2(3) GENERATED ALWAYS AS ROW START HIDDEN NOT NULL
+            CONSTRAINT DF_ProductPrices_SysStartTime DEFAULT(SYSUTCDATETIME()),
+        SysEndTime   DATETIME2(3) GENERATED ALWAYS AS ROW END   HIDDEN NOT NULL
+            CONSTRAINT DF_ProductPrices_SysEndTime   DEFAULT(CONVERT(DATETIME2(3),'9999-12-31 23:59:59.999')),
+        PERIOD FOR SYSTEM_TIME (SysStartTime, SysEndTime);
+    PRINT 'ProductPrices: PERIOD FOR SYSTEM_TIME added (SysStartTime/SysEndTime).';
+END
+GO
+
+IF NOT EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.ProductPrices') AND temporal_type = 2)
+BEGIN
+    ALTER TABLE dbo.ProductPrices
+    SET (SYSTEM_VERSIONING = ON (
+        HISTORY_TABLE = dbo.ProductPrices_History,
+        HISTORY_RETENTION_PERIOD = 10 YEARS
+    ));
+    PRINT 'ProductPrices: SYSTEM_VERSIONING = ON (history: dbo.ProductPrices_History, retention: 10 years).';
+END
+ELSE
+    PRINT 'ProductPrices: SYSTEM_VERSIONING already ON — skip.';
+GO
+
+IF EXISTS (SELECT 1 FROM sys.tables WHERE name = 'ProductPrices_History' AND schema_id = SCHEMA_ID('dbo'))
+   AND NOT EXISTS (
+       SELECT 1 FROM sys.partitions p
+       JOIN sys.tables t ON t.object_id = p.object_id
+       WHERE t.name = 'ProductPrices_History' AND p.data_compression = 2
+   )
+BEGIN
+    ALTER TABLE dbo.ProductPrices_History REBUILD WITH (DATA_COMPRESSION = PAGE);
+    PRINT 'ProductPrices_History: rebuilt with PAGE compression.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 3. Índices
+-- ═══════════════════════════════════════════════════════════════════════
+
+-- Un único activo por producto (imposibilita violar a nivel BD).
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'UX_ProductPrices_Active' AND object_id = OBJECT_ID('dbo.ProductPrices'))
+BEGIN
+    CREATE UNIQUE INDEX UX_ProductPrices_Active
+        ON dbo.ProductPrices (ProductId)
+        WHERE PriceValidTo IS NULL;
+    PRINT 'Index UX_ProductPrices_Active created.';
+END
+GO
+
+-- Cover para GetPriceAt / GetByProductIdAsync (ProductId + PriceValidFrom con INCLUDEs).
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_ProductPrices_Lookup' AND object_id = OBJECT_ID('dbo.ProductPrices'))
+BEGIN
+    CREATE INDEX IX_ProductPrices_Lookup
+        ON dbo.ProductPrices (ProductId, PriceValidFrom DESC)
+        INCLUDE (Price, PriceValidTo);
+    PRINT 'Index IX_ProductPrices_Lookup created.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 4. SP — dbo.usp_AddProductPrice
+--    Cierre atómico forward-only: SERIALIZABLE + UPDLOCK + HOLDLOCK.
+--    Params de salida: @NewId (BIGINT), @ClosedId (BIGINT — NULL si primer precio).
+-- ═══════════════════════════════════════════════════════════════════════
+GO
+CREATE OR ALTER PROCEDURE dbo.usp_AddProductPrice
+    @ProductId      INT,
+    @Price          DECIMAL(12,2),
+    @PriceValidFrom DATE,
+    @NewId          BIGINT OUTPUT,
+    @ClosedId       BIGINT OUTPUT
+AS
+BEGIN
+    SET NOCOUNT ON;
+    SET XACT_ABORT ON;
+    SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+
+    BEGIN TRY
+        BEGIN TRANSACTION;
+
+        -- Validación: producto debe existir y estar activo.
+        IF NOT EXISTS (SELECT 1 FROM dbo.Product WITH (NOLOCK) WHERE Id = @ProductId AND IsActive = 1)
+        BEGIN
+            ROLLBACK;
+            THROW 50404, 'Product not found or inactive', 1;
+        END
+
+        -- Lee activo con UPDLOCK + HOLDLOCK — bloquea el range key del filtered index.
+        DECLARE @ActiveId BIGINT, @ActivePVF DATE;
+        SELECT TOP 1
+            @ActiveId  = Id,
+            @ActivePVF = PriceValidFrom
+        FROM dbo.ProductPrices WITH (UPDLOCK, HOLDLOCK, ROWLOCK)
+        WHERE ProductId = @ProductId AND PriceValidTo IS NULL;
+
+        -- Forward-only estricto: el nuevo PVF debe ser ESTRICTAMENTE mayor al activo.
+        IF @ActiveId IS NOT NULL AND @PriceValidFrom <= @ActivePVF
+        BEGIN
+            ROLLBACK;
+            THROW 50409, 'ProductPriceForwardOnly: new PriceValidFrom must be > active.PriceValidFrom', 1;
+        END
+
+        -- Cierra el activo previo: PVT = PVF(nuevo) - 1 día.
+        IF @ActiveId IS NOT NULL
+        BEGIN
+            UPDATE dbo.ProductPrices
+               SET PriceValidTo = DATEADD(DAY, -1, @PriceValidFrom)
+             WHERE Id = @ActiveId;
+            SET @ClosedId = @ActiveId;
+        END
+        ELSE
+            SET @ClosedId = NULL;
+
+        -- Inserta el nuevo activo.
+        INSERT INTO dbo.ProductPrices (ProductId, Price, PriceValidFrom, PriceValidTo)
+        VALUES (@ProductId, @Price, @PriceValidFrom, NULL);
+        SET @NewId = SCOPE_IDENTITY();
+
+        COMMIT TRANSACTION;
+    END TRY
+    BEGIN CATCH
+        IF XACT_STATE() <> 0 ROLLBACK TRANSACTION;
+        THROW;
+    END CATCH
+END
+GO
+
+PRINT '';
+PRINT 'V019 applied — dbo.ProductPrices (temporal, retention 10y) + UX_ProductPrices_Active + IX_ProductPrices_Lookup + usp_AddProductPrice.';
+PRINT 'Next migration: V020 (TBD).';
+GO

database/migrations/V020_ROLLBACK.sql

@@ -0,0 +1,33 @@
+-- V020_ROLLBACK.sql
+-- PRC-001: Reversa de V020__add_chargeable_chars_permission.sql.
+--
+-- Pasos:
+--   1. Elimina la asignación del permiso al rol 'admin'.
+--   2. Elimina el permiso del catálogo.
+--
+-- ADVERTENCIA: si algún usuario o rol tiene este permiso asignado explícitamente,
+--   la FK de RolPermiso causará error. Limpiar RolPermiso primero.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- 1. Eliminar asignaciones del permiso a cualquier rol.
+DELETE rp
+FROM dbo.RolPermiso rp
+JOIN dbo.Permiso p ON p.Id = rp.PermisoId
+WHERE p.Codigo = 'tasacion:caracteres_especiales:gestionar';
+PRINT 'V020 rollback: RolPermiso entries for tasacion:caracteres_especiales:gestionar removed.';
+GO
+
+-- 2. Eliminar el permiso del catálogo.
+DELETE FROM dbo.Permiso
+WHERE Codigo = 'tasacion:caracteres_especiales:gestionar';
+PRINT 'V020 rollback: Permiso tasacion:caracteres_especiales:gestionar removed.';
+GO
+
+PRINT '';
+PRINT 'V020 rollback complete.';
+GO

database/migrations/V020__add_chargeable_chars_permission.sql

@@ -0,0 +1,54 @@
+-- V020__add_chargeable_chars_permission.sql
+-- PRC-001: permiso RBAC para ABM de caracteres tasables.
+--
+-- Cambios:
+--   1. Agrega permiso 'tasacion:caracteres_especiales:gestionar' al catálogo.
+--   2. Asigna el permiso al rol 'admin'.
+--
+-- Convención RBAC: modulo:recurso:accion.
+-- Patrón: V007 (MERGE idempotente).
+-- Idempotente: seguro para re-ejecutar.
+-- Reversa: V020_ROLLBACK.sql.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+--
+-- NOTA: V020 se ejecuta ANTES de V021 (tabla) porque el permiso debe existir
+--       antes de que la API arranque con [RequirePermission(...)].
+--       V021 crea la tabla dbo.ChargeableCharConfig.
+--       V022 siembra las 4 filas globales por defecto.
+--
+-- SDD Design: engram sdd/prc-001-word-counter-spike/design (D16/D17)
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- Agregar permiso al catálogo (idempotente via MERGE).
+MERGE dbo.Permiso AS t
+USING (VALUES
+    ('tasacion:caracteres_especiales:gestionar',
+     N'Gestionar caracteres tasables',
+     N'Crear, editar precio y desactivar la configuración de caracteres especiales para tasación.',
+     'tasacion')
+) AS s (Codigo, Nombre, Descripcion, Modulo)
+ON t.Codigo = s.Codigo
+WHEN NOT MATCHED BY TARGET THEN
+    INSERT (Codigo, Nombre, Descripcion, Modulo)
+    VALUES (s.Codigo, s.Nombre, s.Descripcion, s.Modulo);
+GO
+
+-- Asignar a rol 'admin' (idempotente via MERGE).
+MERGE dbo.RolPermiso AS t
+USING (
+    SELECT r.Id AS RolId, p.Id AS PermisoId
+    FROM dbo.Rol     r
+    CROSS JOIN dbo.Permiso p
+    WHERE r.Codigo = 'admin'
+      AND p.Codigo = 'tasacion:caracteres_especiales:gestionar'
+) AS s ON t.RolId = s.RolId AND t.PermisoId = s.PermisoId
+WHEN NOT MATCHED BY TARGET THEN
+    INSERT (RolId, PermisoId) VALUES (s.RolId, s.PermisoId);
+GO
+
+PRINT 'V020 applied — tasacion:caracteres_especiales:gestionar added to catalog and assigned to admin.';
+GO

database/migrations/V021_ROLLBACK.sql

@@ -0,0 +1,79 @@
+-- V021_ROLLBACK.sql
+-- PRC-001: Reversa de V021__create_chargeable_char_config.sql.
+--
+-- Pasos:
+--   1. Deshabilita SYSTEM_VERSIONING en dbo.ChargeableCharConfig (requerido antes de DROP TABLE).
+--   2. Elimina el PERIOD FOR SYSTEM_TIME y las columnas hidden SysStartTime/SysEndTime.
+--   3. Drop de dbo.ChargeableCharConfig_History.
+--   4. Drop de dbo.ChargeableCharConfig (constraints + índices en cascada).
+--   5. Drop de dbo.usp_ChargeableCharConfig_InsertWithClose.
+--   6. Drop de dbo.usp_ChargeableCharConfig_GetActiveForMedio.
+--
+-- ADVERTENCIA: destruye toda la configuración de caracteres tasables. Solo DEV/TEST.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- 1. Deshabilita SYSTEM_VERSIONING (imprescindible antes de DROP TABLE temporal).
+IF EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.ChargeableCharConfig') AND temporal_type = 2)
+BEGIN
+    ALTER TABLE dbo.ChargeableCharConfig SET (SYSTEM_VERSIONING = OFF);
+    PRINT 'ChargeableCharConfig: SYSTEM_VERSIONING = OFF.';
+END
+GO
+
+-- 2. Elimina el PERIOD y las hidden cols.
+IF COL_LENGTH('dbo.ChargeableCharConfig', 'SysStartTime') IS NOT NULL
+BEGIN
+    ALTER TABLE dbo.ChargeableCharConfig
+    DROP PERIOD FOR SYSTEM_TIME;
+
+    IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_ChargeableCharConfig_SysStartTime')
+        ALTER TABLE dbo.ChargeableCharConfig DROP CONSTRAINT DF_ChargeableCharConfig_SysStartTime;
+    IF EXISTS (SELECT 1 FROM sys.default_constraints WHERE name = 'DF_ChargeableCharConfig_SysEndTime')
+        ALTER TABLE dbo.ChargeableCharConfig DROP CONSTRAINT DF_ChargeableCharConfig_SysEndTime;
+
+    ALTER TABLE dbo.ChargeableCharConfig DROP COLUMN SysStartTime;
+    ALTER TABLE dbo.ChargeableCharConfig DROP COLUMN SysEndTime;
+    PRINT 'ChargeableCharConfig: PERIOD + hidden cols dropped.';
+END
+GO
+
+-- 3. Drop de la history table.
+IF OBJECT_ID(N'dbo.ChargeableCharConfig_History', N'U') IS NOT NULL
+BEGIN
+    DROP TABLE dbo.ChargeableCharConfig_History;
+    PRINT 'Table dbo.ChargeableCharConfig_History dropped.';
+END
+GO
+
+-- 4. Drop de la tabla principal.
+IF OBJECT_ID(N'dbo.ChargeableCharConfig', N'U') IS NOT NULL
+BEGIN
+    DROP TABLE dbo.ChargeableCharConfig;
+    PRINT 'Table dbo.ChargeableCharConfig dropped.';
+END
+GO
+
+-- 5. Drop del SP InsertWithClose.
+IF OBJECT_ID(N'dbo.usp_ChargeableCharConfig_InsertWithClose', N'P') IS NOT NULL
+BEGIN
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_InsertWithClose;
+    PRINT 'Procedure dbo.usp_ChargeableCharConfig_InsertWithClose dropped.';
+END
+GO
+
+-- 6. Drop del SP GetActiveForMedio.
+IF OBJECT_ID(N'dbo.usp_ChargeableCharConfig_GetActiveForMedio', N'P') IS NOT NULL
+BEGIN
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_GetActiveForMedio;
+    PRINT 'Procedure dbo.usp_ChargeableCharConfig_GetActiveForMedio dropped.';
+END
+GO
+
+PRINT '';
+PRINT 'V021 rollback complete — dbo.ChargeableCharConfig, dbo.ChargeableCharConfig_History, usp_ChargeableCharConfig_InsertWithClose, usp_ChargeableCharConfig_GetActiveForMedio removed.';
+GO

database/migrations/V021__create_chargeable_char_config.sql

@@ -0,0 +1,256 @@
+-- V021__create_chargeable_char_config.sql
+-- PRC-001: ChargeableCharConfig — configuración de caracteres especiales tasables con vigencia civil.
+--
+-- Cambios:
+--   1. dbo.ChargeableCharConfig (FK Medios NULL=global, SYSTEM_VERSIONING ON, retention 10 años).
+--   2. Índices: filtered UX vigente por (MedioId,Symbol); cover IX para GetActiveForMedio.
+--   3. SP dbo.usp_ChargeableCharConfig_InsertWithClose (SERIALIZABLE + UPDLOCK, forward-only).
+--   4. SP dbo.usp_ChargeableCharConfig_GetActiveForMedio (CTE + ROW_NUMBER per-medio/global).
+--
+-- Patrón: V019 (SYSTEM_VERSIONING + PAGE compression + SERIALIZABLE SP).
+-- Idempotente: seguro para re-ejecutar.
+-- Reversa: V021_ROLLBACK.sql.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+--
+-- Notas:
+--   - SysStartTime/SysEndTime como hidden cols: evita colisión con business cols ValidFrom/ValidTo (D4).
+--   - DECIMAL(18,4) para PricePerUnit (mayor granularidad que ProductPrices) (D8).
+--   - MedioId NULL = global fallback; per-medio overrides global in GetActiveForMedio (D2/D6).
+--   - Forward-only estricto: THROW 50409 si new ValidFrom <= activo.ValidFrom (D9).
+--   - UX filtered WHERE ValidTo IS NULL: SQL Server trata (NULL,'$') como valor igual → enforza 1 vigente global (D7).
+--   - dbo.ChargeableCharConfig_History debe agregarse a TablesToIgnore en SqlTestFixture.cs (Respawn).
+--
+-- SDD Design: engram sdd/prc-001-word-counter-spike/design
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 1. dbo.ChargeableCharConfig
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF OBJECT_ID(N'dbo.ChargeableCharConfig', N'U') IS NULL
+BEGIN
+    CREATE TABLE dbo.ChargeableCharConfig (
+        Id            BIGINT IDENTITY(1,1) NOT NULL
+            CONSTRAINT PK_ChargeableCharConfig PRIMARY KEY,
+        MedioId       INT           NULL,    -- NULL = global fallback
+        Symbol        NVARCHAR(4)   NOT NULL,
+        Category      NVARCHAR(32)  NOT NULL, -- enum-as-string: Currency/Percentage/Exclamation/Question/Other
+        PricePerUnit  DECIMAL(18,4) NOT NULL,
+        ValidFrom     DATE          NOT NULL,
+        ValidTo       DATE          NULL,
+        IsActive      BIT           NOT NULL
+            CONSTRAINT DF_ChargeableCharConfig_IsActive DEFAULT(1),
+        FechaCreacion DATETIME2(3)  NOT NULL
+            CONSTRAINT DF_ChargeableCharConfig_FechaCreacion DEFAULT(SYSUTCDATETIME()),
+        CONSTRAINT FK_ChargeableCharConfig_Medio
+            FOREIGN KEY (MedioId) REFERENCES dbo.Medio(Id) ON DELETE NO ACTION,
+        CONSTRAINT CK_ChargeableCharConfig_Price_Positive
+            CHECK (PricePerUnit > 0),
+        CONSTRAINT CK_ChargeableCharConfig_Symbol_NotEmpty
+            CHECK (LEN(Symbol) > 0),
+        CONSTRAINT CK_ChargeableCharConfig_ValidRange
+            CHECK (ValidTo IS NULL OR ValidTo >= ValidFrom)
+    );
+    PRINT 'Table dbo.ChargeableCharConfig created.';
+END
+ELSE
+    PRINT 'Table dbo.ChargeableCharConfig already exists — skip.';
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 2. SYSTEM_VERSIONING — ChargeableCharConfig
+--    SysStartTime/SysEndTime para no colisionar con business cols ValidFrom/ValidTo (D4).
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF COL_LENGTH('dbo.ChargeableCharConfig', 'SysStartTime') IS NULL
+BEGIN
+    ALTER TABLE dbo.ChargeableCharConfig
+    ADD
+        SysStartTime DATETIME2(3) GENERATED ALWAYS AS ROW START HIDDEN NOT NULL
+            CONSTRAINT DF_ChargeableCharConfig_SysStartTime DEFAULT(SYSUTCDATETIME()),
+        SysEndTime   DATETIME2(3) GENERATED ALWAYS AS ROW END   HIDDEN NOT NULL
+            CONSTRAINT DF_ChargeableCharConfig_SysEndTime   DEFAULT(CONVERT(DATETIME2(3),'9999-12-31 23:59:59.999')),
+        PERIOD FOR SYSTEM_TIME (SysStartTime, SysEndTime);
+    PRINT 'ChargeableCharConfig: PERIOD FOR SYSTEM_TIME added (SysStartTime/SysEndTime).';
+END
+GO
+
+IF NOT EXISTS (SELECT 1 FROM sys.tables WHERE object_id = OBJECT_ID('dbo.ChargeableCharConfig') AND temporal_type = 2)
+BEGIN
+    ALTER TABLE dbo.ChargeableCharConfig
+    SET (SYSTEM_VERSIONING = ON (
+        HISTORY_TABLE = dbo.ChargeableCharConfig_History,
+        HISTORY_RETENTION_PERIOD = 10 YEARS
+    ));
+    PRINT 'ChargeableCharConfig: SYSTEM_VERSIONING = ON (history: dbo.ChargeableCharConfig_History, retention: 10 years).';
+END
+ELSE
+    PRINT 'ChargeableCharConfig: SYSTEM_VERSIONING already ON — skip.';
+GO
+
+IF EXISTS (SELECT 1 FROM sys.tables WHERE name = 'ChargeableCharConfig_History' AND schema_id = SCHEMA_ID('dbo'))
+   AND NOT EXISTS (
+       SELECT 1 FROM sys.partitions p
+       JOIN sys.tables t ON t.object_id = p.object_id
+       WHERE t.name = 'ChargeableCharConfig_History' AND p.data_compression = 2
+   )
+BEGIN
+    ALTER TABLE dbo.ChargeableCharConfig_History REBUILD WITH (DATA_COMPRESSION = PAGE);
+    PRINT 'ChargeableCharConfig_History: rebuilt with PAGE compression.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 3. Índices
+-- ═══════════════════════════════════════════════════════════════════════
+
+-- Un único vigente por (MedioId, Symbol).
+-- SQL Server trata NULL como "distinto" en índices únicos: (NULL,'$') colisiona consigo mismo
+-- → enforza exactamente 1 vigente global por símbolo (D7).
+IF NOT EXISTS (
+    SELECT 1 FROM sys.indexes
+    WHERE name = 'UX_ChargeableCharConfig_Vigente'
+      AND object_id = OBJECT_ID('dbo.ChargeableCharConfig')
+)
+BEGIN
+    CREATE UNIQUE INDEX UX_ChargeableCharConfig_Vigente
+        ON dbo.ChargeableCharConfig (MedioId, Symbol)
+        WHERE ValidTo IS NULL;
+    PRINT 'Index UX_ChargeableCharConfig_Vigente created.';
+END
+GO
+
+-- Cover para GetActiveForMedio y List.
+IF NOT EXISTS (
+    SELECT 1 FROM sys.indexes
+    WHERE name = 'IX_ChargeableCharConfig_Query'
+      AND object_id = OBJECT_ID('dbo.ChargeableCharConfig')
+)
+BEGIN
+    CREATE INDEX IX_ChargeableCharConfig_Query
+        ON dbo.ChargeableCharConfig (MedioId, Symbol, ValidFrom, ValidTo)
+        INCLUDE (PricePerUnit, IsActive, Category);
+    PRINT 'Index IX_ChargeableCharConfig_Query created.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 4. SP — dbo.usp_ChargeableCharConfig_InsertWithClose
+--    Cierre atómico forward-only: SERIALIZABLE + UPDLOCK + HOLDLOCK.
+--    @MedioId NULL = global; existencia validada sólo cuando NOT NULL.
+--    THROW 50404: Medio not found.
+--    THROW 50409: ForwardOnly — new ValidFrom must be > active.ValidFrom.
+--    Params de salida: @NewId (BIGINT), @ClosedId (BIGINT — NULL si primer precio).
+-- ═══════════════════════════════════════════════════════════════════════
+GO
+CREATE OR ALTER PROCEDURE dbo.usp_ChargeableCharConfig_InsertWithClose
+    @MedioId      INT           = NULL,
+    @Symbol       NVARCHAR(4),
+    @Category     NVARCHAR(32),
+    @PricePerUnit DECIMAL(18,4),
+    @ValidFrom    DATE,
+    @NewId        BIGINT OUTPUT,
+    @ClosedId     BIGINT OUTPUT
+AS
+BEGIN
+    SET NOCOUNT ON;
+    SET XACT_ABORT ON;
+    SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+
+    BEGIN TRY
+        BEGIN TRANSACTION;
+
+        -- Validar MedioId sólo cuando se proporciona (NULL = global fallback siempre válido).
+        IF @MedioId IS NOT NULL
+           AND NOT EXISTS (SELECT 1 FROM dbo.Medio WITH (NOLOCK) WHERE Id = @MedioId)
+        BEGIN
+            ROLLBACK;
+            THROW 50404, 'Medio not found', 1;
+        END
+
+        -- Lee el vigente actual con bloqueo de rango para serialización.
+        DECLARE @ActiveId BIGINT, @ActiveValidFrom DATE;
+        SELECT TOP 1
+            @ActiveId        = Id,
+            @ActiveValidFrom = ValidFrom
+        FROM dbo.ChargeableCharConfig WITH (UPDLOCK, HOLDLOCK, ROWLOCK)
+        WHERE ((@MedioId IS NULL     AND MedioId IS NULL)
+            OR (@MedioId IS NOT NULL AND MedioId = @MedioId))
+          AND Symbol  = @Symbol
+          AND ValidTo IS NULL;
+
+        -- Forward-only estricto: new ValidFrom debe ser ESTRICTAMENTE mayor al activo.
+        IF @ActiveId IS NOT NULL AND @ValidFrom <= @ActiveValidFrom
+        BEGIN
+            ROLLBACK;
+            THROW 50409, 'ChargeableCharConfigForwardOnly: new ValidFrom must be > active.ValidFrom', 1;
+        END
+
+        -- Cierra el vigente previo: ValidTo = ValidFrom(nuevo) - 1 día.
+        IF @ActiveId IS NOT NULL
+        BEGIN
+            UPDATE dbo.ChargeableCharConfig
+               SET ValidTo = DATEADD(DAY, -1, @ValidFrom)
+             WHERE Id = @ActiveId;
+            SET @ClosedId = @ActiveId;
+        END
+        ELSE
+            SET @ClosedId = NULL;
+
+        -- Inserta el nuevo vigente.
+        INSERT INTO dbo.ChargeableCharConfig
+            (MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive)
+        VALUES
+            (@MedioId, @Symbol, @Category, @PricePerUnit, @ValidFrom, NULL, 1);
+        SET @NewId = SCOPE_IDENTITY();
+
+        COMMIT TRANSACTION;
+    END TRY
+    BEGIN CATCH
+        IF XACT_STATE() <> 0 ROLLBACK TRANSACTION;
+        THROW;
+    END CATCH
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- 5. SP — dbo.usp_ChargeableCharConfig_GetActiveForMedio
+--    Resolución per-medio + global fallback: 1 fila por Symbol.
+--    CTE + ROW_NUMBER PARTITION BY Symbol ORDER BY per-medio(0) vs global(1).
+-- ═══════════════════════════════════════════════════════════════════════
+GO
+CREATE OR ALTER PROCEDURE dbo.usp_ChargeableCharConfig_GetActiveForMedio
+    @MedioId   INT,
+    @AsOfDate  DATE
+AS
+BEGIN
+    SET NOCOUNT ON;
+    WITH Candidates AS (
+        SELECT
+            Id, MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive,
+            ROW_NUMBER() OVER (
+                PARTITION BY Symbol
+                ORDER BY
+                    CASE WHEN MedioId = @MedioId THEN 0 ELSE 1 END, -- prefer specific over global
+                    ValidFrom DESC
+            ) AS rn
+        FROM dbo.ChargeableCharConfig
+        WHERE IsActive   = 1
+          AND ValidFrom <= @AsOfDate
+          AND (ValidTo IS NULL OR ValidTo >= @AsOfDate)
+          AND (MedioId = @MedioId OR MedioId IS NULL)
+    )
+    SELECT Id, MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive
+    FROM   Candidates
+    WHERE  rn = 1;
+END
+GO
+
+PRINT '';
+PRINT 'V021 applied — dbo.ChargeableCharConfig (temporal, retention 10y) + UX_ChargeableCharConfig_Vigente + IX_ChargeableCharConfig_Query + usp_ChargeableCharConfig_InsertWithClose + usp_ChargeableCharConfig_GetActiveForMedio.';
+PRINT 'Next migration: V022 (seed ChargeableCharConfig).';
+GO

database/migrations/V022_ROLLBACK.sql

@@ -0,0 +1,23 @@
+-- V022_ROLLBACK.sql
+-- PRC-001: Reversa de V022__seed_chargeable_char_config.sql.
+--
+-- Elimina las 4 filas globales de seed (MedioId NULL, símbolos $/%/!/¡, ValidTo NULL).
+-- Solo elimina las filas vigentes (ValidTo IS NULL) para no romper el historial temporal.
+--
+-- ADVERTENCIA: si alguna de estas filas fue cerrada (ValidTo SET), el rollback las ignora
+--   (ya no son vigentes). La historia temporal queda intacta.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+DELETE FROM dbo.ChargeableCharConfig
+WHERE MedioId IS NULL
+  AND Symbol IN (N'$', N'%', N'!', N'¡')
+  AND ValidTo IS NULL;
+GO
+
+PRINT 'V022 rollback complete — global seed rows ($, %, !, ¡) removed.';
+GO

database/migrations/V022__seed_chargeable_char_config.sql

@@ -0,0 +1,44 @@
+-- V022__seed_chargeable_char_config.sql
+-- PRC-001: seed de las 4 configuraciones globales de caracteres tasables por defecto.
+--
+-- Cambios:
+--   1. Inserta 4 filas globales (MedioId NULL): $, %, !, ¡ — precios placeholder 1.0000.
+--      El equipo de negocio seteará los valores reales desde el CMS.
+--
+-- Patrón: MERGE idempotente ON (MedioId IS NULL AND Symbol AND ValidTo IS NULL).
+-- Idempotente: seguro para re-ejecutar.
+-- Reversa: V022_ROLLBACK.sql.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+--
+-- Depends on: V021 (dbo.ChargeableCharConfig must exist).
+--
+-- Notas:
+--   - MedioId NULL = global fallback; aplica a todos los medios a menos que exista
+--     una fila per-medio más específica (resolución en usp_ChargeableCharConfig_GetActiveForMedio).
+--   - ValidFrom = 2026-01-01: retroactivo al inicio del año fiscal 2026.
+--   - ValidTo NULL = vigente (sin fecha de cierre).
+--   - PricePerUnit 1.0000 son placeholders — CONFIRMAR con el área de tasación.
+--
+-- SDD Design: engram sdd/prc-001-word-counter-spike/design (§3.3)
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+MERGE dbo.ChargeableCharConfig AS t
+USING (VALUES
+    (NULL, N'$',  N'Currency',    CAST(1.0000 AS DECIMAL(18,4)), CAST('2026-01-01' AS DATE)),
+    (NULL, N'%',  N'Percentage',  CAST(1.0000 AS DECIMAL(18,4)), CAST('2026-01-01' AS DATE)),
+    (NULL, N'!',  N'Exclamation', CAST(1.0000 AS DECIMAL(18,4)), CAST('2026-01-01' AS DATE)),
+    (NULL, N'¡',  N'Exclamation', CAST(1.0000 AS DECIMAL(18,4)), CAST('2026-01-01' AS DATE))
+) AS s (MedioId, Symbol, Category, PricePerUnit, ValidFrom)
+ON (t.MedioId IS NULL AND s.MedioId IS NULL AND t.Symbol = s.Symbol AND t.ValidTo IS NULL)
+WHEN NOT MATCHED THEN
+    INSERT (MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive)
+    VALUES (s.MedioId, s.Symbol, s.Category, s.PricePerUnit, s.ValidFrom, NULL, 1);
+GO
+
+PRINT 'V022 applied — 4 global ChargeableCharConfig defaults seeded ($, %, !, ¡).';
+PRINT 'NOTE: PricePerUnit values are placeholders (1.0000). Update via CMS before going live.';
+GO

database/migrations/V023_ROLLBACK.sql

@@ -0,0 +1,246 @@
+-- V023_ROLLBACK.sql
+-- PRC-001: Reversa de V023__refactor_chargeable_char_config_to_product_type.sql.
+--
+-- ADVERTENCIA: rollback destructivo — elimina ProductTypeId y restaura MedioId.
+--   - Todos los datos de ProductTypeId se pierden.
+--   - Las filas globales (ProductTypeId NULL) se preservan como globales (MedioId NULL).
+--   - El historial temporal puede quedar inconsistente si la tabla fue modificada después.
+--
+-- Solo para uso en DEV/TEST. No ejecutar en producción si hay datos de ProductTypeId.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- ─── 1. Drop new SPs ────────────────────────────────────────────────────────
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_ReactivateWithGuard', 'P') IS NOT NULL
+BEGIN
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_ReactivateWithGuard;
+    PRINT 'V023 ROLLBACK: usp_ChargeableCharConfig_ReactivateWithGuard dropped.';
+END
+GO
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_GetActiveForProductType', 'P') IS NOT NULL
+BEGIN
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_GetActiveForProductType;
+    PRINT 'V023 ROLLBACK: usp_ChargeableCharConfig_GetActiveForProductType dropped.';
+END
+GO
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_InsertWithClose', 'P') IS NOT NULL
+BEGIN
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_InsertWithClose;
+    PRINT 'V023 ROLLBACK: usp_ChargeableCharConfig_InsertWithClose dropped.';
+END
+GO
+
+-- ─── 2. Reverse table alterations if ProductTypeId column exists ─────────────
+
+IF EXISTS (SELECT 1 FROM sys.tables WHERE name = 'ChargeableCharConfig' AND schema_id = SCHEMA_ID('dbo'))
+   AND EXISTS (SELECT 1 FROM sys.columns
+               WHERE object_id = OBJECT_ID('dbo.ChargeableCharConfig')
+                 AND name = 'ProductTypeId')
+BEGIN
+    -- 2a. Turn off SYSTEM_VERSIONING
+    ALTER TABLE dbo.ChargeableCharConfig SET (SYSTEM_VERSIONING = OFF);
+    PRINT 'V023 ROLLBACK: SYSTEM_VERSIONING = OFF.';
+
+    -- 2b. Drop indexes on ProductTypeId
+    IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'UX_ChargeableCharConfig_Vigente'
+               AND object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        DROP INDEX UX_ChargeableCharConfig_Vigente ON dbo.ChargeableCharConfig;
+        PRINT 'V023 ROLLBACK: UX_ChargeableCharConfig_Vigente dropped.';
+    END
+
+    IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_ChargeableCharConfig_Query'
+               AND object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        DROP INDEX IX_ChargeableCharConfig_Query ON dbo.ChargeableCharConfig;
+        PRINT 'V023 ROLLBACK: IX_ChargeableCharConfig_Query dropped.';
+    END
+
+    -- 2c. Drop FK to ProductType
+    DECLARE @fk_pt sysname;
+    SELECT @fk_pt = name
+      FROM sys.foreign_keys
+     WHERE parent_object_id = OBJECT_ID('dbo.ChargeableCharConfig')
+       AND referenced_object_id = OBJECT_ID('dbo.ProductType');
+    IF @fk_pt IS NOT NULL
+    BEGIN
+        EXEC('ALTER TABLE dbo.ChargeableCharConfig DROP CONSTRAINT ' + @fk_pt);
+        PRINT 'V023 ROLLBACK: FK_ChargeableCharConfig_ProductType dropped.';
+    END
+
+    -- 2d. Drop NonNegative price check; restore Positive check
+    IF EXISTS (SELECT 1 FROM sys.check_constraints
+               WHERE name = 'CK_ChargeableCharConfig_Price_NonNegative'
+                 AND parent_object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        ALTER TABLE dbo.ChargeableCharConfig DROP CONSTRAINT CK_ChargeableCharConfig_Price_NonNegative;
+        PRINT 'V023 ROLLBACK: CK_ChargeableCharConfig_Price_NonNegative dropped.';
+    END
+
+    IF NOT EXISTS (SELECT 1 FROM sys.check_constraints
+                   WHERE name = 'CK_ChargeableCharConfig_Price_Positive'
+                     AND parent_object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        ALTER TABLE dbo.ChargeableCharConfig
+            ADD CONSTRAINT CK_ChargeableCharConfig_Price_Positive CHECK (PricePerUnit > 0);
+        PRINT 'V023 ROLLBACK: CK_ChargeableCharConfig_Price_Positive restored.';
+    END
+
+    -- 2e. Drop ProductTypeId column from main + history
+    ALTER TABLE dbo.ChargeableCharConfig DROP COLUMN ProductTypeId;
+    PRINT 'V023 ROLLBACK: ProductTypeId dropped from ChargeableCharConfig.';
+
+    IF EXISTS (SELECT 1 FROM sys.columns
+               WHERE object_id = OBJECT_ID('dbo.ChargeableCharConfig_History')
+                 AND name = 'ProductTypeId')
+    BEGIN
+        ALTER TABLE dbo.ChargeableCharConfig_History DROP COLUMN ProductTypeId;
+        PRINT 'V023 ROLLBACK: ProductTypeId dropped from ChargeableCharConfig_History.';
+    END
+
+    -- 2f. Restore MedioId column
+    ALTER TABLE dbo.ChargeableCharConfig ADD MedioId INT NULL;
+    ALTER TABLE dbo.ChargeableCharConfig_History ADD MedioId INT NULL;
+    PRINT 'V023 ROLLBACK: MedioId restored.';
+
+    -- 2g. Restore FK to Medio
+    ALTER TABLE dbo.ChargeableCharConfig
+        ADD CONSTRAINT FK_ChargeableCharConfig_Medio
+        FOREIGN KEY (MedioId) REFERENCES dbo.Medio(Id) ON DELETE NO ACTION;
+    PRINT 'V023 ROLLBACK: FK_ChargeableCharConfig_Medio restored.';
+
+    -- 2h. Restore indexes on MedioId
+    CREATE UNIQUE NONCLUSTERED INDEX UX_ChargeableCharConfig_Vigente
+        ON dbo.ChargeableCharConfig (MedioId, Symbol)
+        WHERE ValidTo IS NULL;
+    PRINT 'V023 ROLLBACK: UX_ChargeableCharConfig_Vigente restored (MedioId).';
+
+    CREATE NONCLUSTERED INDEX IX_ChargeableCharConfig_Query
+        ON dbo.ChargeableCharConfig (MedioId, Symbol, ValidFrom, ValidTo)
+        INCLUDE (PricePerUnit, IsActive, Category);
+    PRINT 'V023 ROLLBACK: IX_ChargeableCharConfig_Query restored (MedioId).';
+
+    -- 2i. Restore SYSTEM_VERSIONING
+    ALTER TABLE dbo.ChargeableCharConfig
+        SET (SYSTEM_VERSIONING = ON (
+            HISTORY_TABLE = dbo.ChargeableCharConfig_History,
+            HISTORY_RETENTION_PERIOD = 10 YEARS
+        ));
+    PRINT 'V023 ROLLBACK: SYSTEM_VERSIONING = ON restored.';
+END
+ELSE
+    PRINT 'V023 ROLLBACK: ProductTypeId column not found — table already in MedioId state or missing, skipping.';
+GO
+
+-- ─── 3. Restore original SPs ────────────────────────────────────────────────
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_InsertWithClose', 'P') IS NULL
+    EXEC('CREATE PROCEDURE dbo.usp_ChargeableCharConfig_InsertWithClose AS RETURN 0');
+GO
+
+ALTER PROCEDURE dbo.usp_ChargeableCharConfig_InsertWithClose
+    @MedioId      INT           = NULL,
+    @Symbol       NVARCHAR(4),
+    @Category     NVARCHAR(32),
+    @PricePerUnit DECIMAL(18,4),
+    @ValidFrom    DATE,
+    @NewId        BIGINT OUTPUT,
+    @ClosedId     BIGINT OUTPUT
+AS
+BEGIN
+    SET NOCOUNT ON;
+    SET XACT_ABORT ON;
+    SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+
+    BEGIN TRY
+        BEGIN TRANSACTION;
+
+        IF @MedioId IS NOT NULL
+           AND NOT EXISTS (SELECT 1 FROM dbo.Medio WITH (NOLOCK) WHERE Id = @MedioId)
+        BEGIN
+            ROLLBACK;
+            THROW 50404, 'Medio not found', 1;
+        END
+
+        DECLARE @ActiveId BIGINT, @ActiveValidFrom DATE;
+        SELECT TOP 1
+            @ActiveId        = Id,
+            @ActiveValidFrom = ValidFrom
+        FROM dbo.ChargeableCharConfig WITH (UPDLOCK, HOLDLOCK, ROWLOCK)
+        WHERE ((@MedioId IS NULL     AND MedioId IS NULL)
+            OR (@MedioId IS NOT NULL AND MedioId = @MedioId))
+          AND Symbol  = @Symbol
+          AND ValidTo IS NULL;
+
+        IF @ActiveId IS NOT NULL AND @ValidFrom <= @ActiveValidFrom
+        BEGIN
+            ROLLBACK;
+            THROW 50409, 'ChargeableCharConfigForwardOnly: new ValidFrom must be > active.ValidFrom', 1;
+        END
+
+        IF @ActiveId IS NOT NULL
+        BEGIN
+            UPDATE dbo.ChargeableCharConfig
+               SET ValidTo = DATEADD(DAY, -1, @ValidFrom)
+             WHERE Id = @ActiveId;
+            SET @ClosedId = @ActiveId;
+        END
+        ELSE
+            SET @ClosedId = NULL;
+
+        INSERT INTO dbo.ChargeableCharConfig
+            (MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive)
+        VALUES
+            (@MedioId, @Symbol, @Category, @PricePerUnit, @ValidFrom, NULL, 1);
+        SET @NewId = SCOPE_IDENTITY();
+
+        COMMIT TRANSACTION;
+    END TRY
+    BEGIN CATCH
+        IF XACT_STATE() <> 0 ROLLBACK TRANSACTION;
+        THROW;
+    END CATCH
+END
+GO
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_GetActiveForMedio', 'P') IS NULL
+    EXEC('CREATE PROCEDURE dbo.usp_ChargeableCharConfig_GetActiveForMedio AS RETURN 0');
+GO
+
+ALTER PROCEDURE dbo.usp_ChargeableCharConfig_GetActiveForMedio
+    @MedioId  INT,
+    @AsOfDate DATE
+AS
+BEGIN
+    SET NOCOUNT ON;
+    WITH Candidates AS (
+        SELECT
+            Id, MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive,
+            ROW_NUMBER() OVER (
+                PARTITION BY Symbol
+                ORDER BY
+                    CASE WHEN MedioId = @MedioId THEN 0 ELSE 1 END,
+                    ValidFrom DESC
+            ) AS rn
+        FROM dbo.ChargeableCharConfig
+        WHERE IsActive   = 1
+          AND ValidFrom <= @AsOfDate
+          AND (ValidTo IS NULL OR ValidTo >= @AsOfDate)
+          AND (MedioId = @MedioId OR MedioId IS NULL)
+    )
+    SELECT Id, MedioId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive
+    FROM   Candidates
+    WHERE  rn = 1;
+END
+GO
+
+PRINT '';
+PRINT 'V023 ROLLBACK complete — ChargeableCharConfig restored to MedioId model.';
+GO

database/migrations/V023__refactor_chargeable_char_config_to_product_type.sql

@@ -0,0 +1,414 @@
+-- V023__refactor_chargeable_char_config_to_product_type.sql
+-- PRC-001 scope delta: ChargeableCharConfig per ProductType (reemplaza per-Medio).
+--
+-- Cambios:
+--   1. DROP MedioId + FK_ChargeableCharConfig_Medio + índices que lo referencian.
+--   2. ADD ProductTypeId (nullable = global fallback) + FK_ChargeableCharConfig_ProductType.
+--   3. Recrea índices con ProductTypeId (UX_Vigente + IX_Query).
+--   4. DROP+CREATE usp_ChargeableCharConfig_InsertWithClose (@MedioId → @ProductTypeId).
+--   5. DROP usp_ChargeableCharConfig_GetActiveForMedio + CREATE usp_ChargeableCharConfig_GetActiveForProductType.
+--   6. NEW SP usp_ChargeableCharConfig_ReactivateWithGuard (opción A+guard para feature 3).
+--   7. DROP CK_ChargeableCharConfig_Price_Positive (se permite 0.0000 para opt-in billing).
+--      Reemplaza con CK_ChargeableCharConfig_Price_NonNegative (>= 0).
+--
+-- Patrón: idempotente con IF EXISTS guards. Bloque principal protegido por la presencia
+--         de la columna MedioId — si no existe ya fue refactorizada, el bloque no ejecuta.
+-- SYSTEM_VERSIONING: OFF al inicio del ALTER block, ON al final (con history table + retention).
+-- Depende de: V017 (dbo.ProductType debe existir).
+-- Reversa: V023_ROLLBACK.sql.
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+--
+-- SDD Design: engram sdd/prc-001-word-counter-spike/design
+-- Scope delta: engram sdd/prc-001-word-counter-spike/scope-delta-1
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- Bloque principal: solo ejecuta si la tabla existe Y todavía tiene MedioId
+-- (guard idempotente: si ya fue refactorizada, el bloque se saltea completo).
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF EXISTS (SELECT 1 FROM sys.tables WHERE name = 'ChargeableCharConfig' AND schema_id = SCHEMA_ID('dbo'))
+   AND EXISTS (SELECT 1 FROM sys.columns
+               WHERE object_id = OBJECT_ID('dbo.ChargeableCharConfig')
+                 AND name = 'MedioId')
+BEGIN
+    PRINT 'V023: MedioId column found — proceeding with refactor.';
+
+    -- ─── 1. Turn OFF SYSTEM_VERSIONING (idempotent — skip if already OFF) ───
+    IF EXISTS (SELECT 1 FROM sys.tables
+               WHERE name = 'ChargeableCharConfig'
+                 AND schema_id = SCHEMA_ID('dbo')
+                 AND temporal_type = 2)  -- 2 = SYSTEM_VERSIONED_TEMPORAL_TABLE
+    BEGIN
+        ALTER TABLE dbo.ChargeableCharConfig SET (SYSTEM_VERSIONING = OFF);
+        PRINT 'V023: SYSTEM_VERSIONING = OFF.';
+    END
+    ELSE
+        PRINT 'V023: SYSTEM_VERSIONING already OFF — skipping.';
+
+    -- ─── 2. Drop indexes that reference MedioId ────────────────────────
+    IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'UX_ChargeableCharConfig_Vigente'
+               AND object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        DROP INDEX UX_ChargeableCharConfig_Vigente ON dbo.ChargeableCharConfig;
+        PRINT 'V023: UX_ChargeableCharConfig_Vigente dropped.';
+    END
+
+    IF EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_ChargeableCharConfig_Query'
+               AND object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        DROP INDEX IX_ChargeableCharConfig_Query ON dbo.ChargeableCharConfig;
+        PRINT 'V023: IX_ChargeableCharConfig_Query dropped.';
+    END
+
+    -- ─── 3. Drop FK to Medio ────────────────────────────────────────────
+    DECLARE @fk_name sysname;
+    SELECT @fk_name = name
+      FROM sys.foreign_keys
+     WHERE parent_object_id = OBJECT_ID('dbo.ChargeableCharConfig')
+       AND referenced_object_id = OBJECT_ID('dbo.Medio');
+    IF @fk_name IS NOT NULL
+    BEGIN
+        EXEC('ALTER TABLE dbo.ChargeableCharConfig DROP CONSTRAINT ' + @fk_name);
+        PRINT 'V023: FK_ChargeableCharConfig_Medio dropped.';
+    END
+
+    -- ─── 4. Drop MedioId column (drop DF constraint first if present) ───
+    DECLARE @df_medio sysname;
+    SELECT @df_medio = dc.name
+      FROM sys.default_constraints dc
+      JOIN sys.columns c ON c.default_object_id = dc.object_id
+     WHERE c.object_id = OBJECT_ID('dbo.ChargeableCharConfig')
+       AND c.name = 'MedioId';
+    IF @df_medio IS NOT NULL
+    BEGIN
+        EXEC('ALTER TABLE dbo.ChargeableCharConfig DROP CONSTRAINT ' + @df_medio);
+        PRINT 'V023: Default constraint on MedioId dropped.';
+    END
+
+    ALTER TABLE dbo.ChargeableCharConfig DROP COLUMN MedioId;
+    PRINT 'V023: MedioId column dropped from ChargeableCharConfig.';
+
+    -- Drop MedioId from history table if present
+    IF EXISTS (SELECT 1 FROM sys.columns
+               WHERE object_id = OBJECT_ID('dbo.ChargeableCharConfig_History')
+                 AND name = 'MedioId')
+    BEGIN
+        -- Drop default constraint on history MedioId if any
+        DECLARE @df_hist_medio sysname;
+        SELECT @df_hist_medio = dc.name
+          FROM sys.default_constraints dc
+          JOIN sys.columns c ON c.default_object_id = dc.object_id
+         WHERE c.object_id = OBJECT_ID('dbo.ChargeableCharConfig_History')
+           AND c.name = 'MedioId';
+        IF @df_hist_medio IS NOT NULL
+            EXEC('ALTER TABLE dbo.ChargeableCharConfig_History DROP CONSTRAINT ' + @df_hist_medio);
+
+        ALTER TABLE dbo.ChargeableCharConfig_History DROP COLUMN MedioId;
+        PRINT 'V023: MedioId column dropped from ChargeableCharConfig_History.';
+    END
+
+    -- ─── 5. Drop CK_Price_Positive, replace with CK_Price_NonNegative ──
+    --    V024 seeds PricePerUnit = 0.0000 (opt-in billing). Old check (> 0) would block it.
+    IF EXISTS (SELECT 1 FROM sys.check_constraints
+               WHERE name = 'CK_ChargeableCharConfig_Price_Positive'
+                 AND parent_object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        ALTER TABLE dbo.ChargeableCharConfig DROP CONSTRAINT CK_ChargeableCharConfig_Price_Positive;
+        PRINT 'V023: CK_ChargeableCharConfig_Price_Positive dropped.';
+    END
+
+    IF NOT EXISTS (SELECT 1 FROM sys.check_constraints
+                   WHERE name = 'CK_ChargeableCharConfig_Price_NonNegative'
+                     AND parent_object_id = OBJECT_ID('dbo.ChargeableCharConfig'))
+    BEGIN
+        ALTER TABLE dbo.ChargeableCharConfig
+            ADD CONSTRAINT CK_ChargeableCharConfig_Price_NonNegative
+            CHECK (PricePerUnit >= 0);
+        PRINT 'V023: CK_ChargeableCharConfig_Price_NonNegative added (>= 0, opt-in billing).';
+    END
+
+    -- ─── 6. Add ProductTypeId column ────────────────────────────────────
+    ALTER TABLE dbo.ChargeableCharConfig
+        ADD ProductTypeId INT NULL;  -- NULL = global fallback
+    PRINT 'V023: ProductTypeId column added to ChargeableCharConfig.';
+
+    ALTER TABLE dbo.ChargeableCharConfig_History
+        ADD ProductTypeId INT NULL;
+    PRINT 'V023: ProductTypeId column added to ChargeableCharConfig_History.';
+
+    -- ─── 7. Add FK to ProductType ────────────────────────────────────────
+    ALTER TABLE dbo.ChargeableCharConfig
+        ADD CONSTRAINT FK_ChargeableCharConfig_ProductType
+        FOREIGN KEY (ProductTypeId) REFERENCES dbo.ProductType(Id) ON DELETE NO ACTION;
+    PRINT 'V023: FK_ChargeableCharConfig_ProductType added.';
+
+    -- ─── 8. Recreate filtered unique index with ProductTypeId ────────────
+    -- 1 vigente per (ProductTypeId, Symbol). NULL ProductTypeId = global fallback.
+    -- SQL Server trata NULL como "distinto" en unique indexes → enforza 1 vigente global.
+    CREATE UNIQUE NONCLUSTERED INDEX UX_ChargeableCharConfig_Vigente
+        ON dbo.ChargeableCharConfig (ProductTypeId, Symbol)
+        WHERE ValidTo IS NULL;
+    PRINT 'V023: UX_ChargeableCharConfig_Vigente recreated (ProductTypeId, Symbol).';
+
+    -- ─── 9. Recreate cover index with ProductTypeId ──────────────────────
+    CREATE NONCLUSTERED INDEX IX_ChargeableCharConfig_Query
+        ON dbo.ChargeableCharConfig (ProductTypeId, Symbol, ValidFrom, ValidTo)
+        INCLUDE (PricePerUnit, IsActive, Category);
+    PRINT 'V023: IX_ChargeableCharConfig_Query recreated (ProductTypeId).';
+
+    -- ─── 10. Turn SYSTEM_VERSIONING back ON ──────────────────────────────
+    ALTER TABLE dbo.ChargeableCharConfig
+        SET (SYSTEM_VERSIONING = ON (
+            HISTORY_TABLE = dbo.ChargeableCharConfig_History,
+            HISTORY_RETENTION_PERIOD = 10 YEARS
+        ));
+    PRINT 'V023: SYSTEM_VERSIONING = ON (history: dbo.ChargeableCharConfig_History, retention: 10 years).';
+END
+ELSE
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM sys.tables WHERE name = 'ChargeableCharConfig' AND schema_id = SCHEMA_ID('dbo'))
+        PRINT 'V023: dbo.ChargeableCharConfig does not exist — skipping table refactor.';
+    ELSE
+        PRINT 'V023: MedioId column not found — table already refactored, skipping.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- SP: usp_ChargeableCharConfig_InsertWithClose (@ProductTypeId replaces @MedioId)
+--     Cierre atómico forward-only: SERIALIZABLE + UPDLOCK + HOLDLOCK.
+--     @ProductTypeId NULL = global; FK validada solo cuando NOT NULL (via referential integrity).
+--     THROW 50404: ProductType not found.
+--     THROW 50409: ForwardOnly — new ValidFrom must be > active.ValidFrom.
+--     Output: @NewId (BIGINT), @ClosedId (BIGINT — NULL if first price for symbol).
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_InsertWithClose', 'P') IS NOT NULL
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_InsertWithClose;
+GO
+
+CREATE PROCEDURE dbo.usp_ChargeableCharConfig_InsertWithClose
+    @ProductTypeId INT           = NULL,
+    @Symbol        NVARCHAR(4),
+    @Category      NVARCHAR(32),
+    @PricePerUnit  DECIMAL(18,4),
+    @ValidFrom     DATE,
+    @NewId         BIGINT OUTPUT,
+    @ClosedId      BIGINT OUTPUT
+AS
+BEGIN
+    SET NOCOUNT ON;
+    SET XACT_ABORT ON;
+    SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+
+    BEGIN TRY
+        BEGIN TRANSACTION;
+
+        -- Validate ProductTypeId only when provided (NULL = global fallback, always valid).
+        -- FK constraint handles referential integrity; we throw 50404 explicitly for better UX.
+        IF @ProductTypeId IS NOT NULL
+           AND NOT EXISTS (SELECT 1 FROM dbo.ProductType WITH (NOLOCK) WHERE Id = @ProductTypeId)
+        BEGIN
+            ROLLBACK;
+            THROW 50404, 'ProductType not found', 1;
+        END
+
+        -- Read current vigente with range lock for serialization.
+        DECLARE @ActiveId BIGINT, @ActiveValidFrom DATE;
+        SELECT TOP 1
+            @ActiveId        = Id,
+            @ActiveValidFrom = ValidFrom
+        FROM dbo.ChargeableCharConfig WITH (UPDLOCK, HOLDLOCK, ROWLOCK)
+        WHERE ((@ProductTypeId IS NULL     AND ProductTypeId IS NULL)
+            OR (@ProductTypeId IS NOT NULL AND ProductTypeId = @ProductTypeId))
+          AND Symbol  = @Symbol
+          AND ValidTo IS NULL;
+
+        -- Forward-only strict: new ValidFrom must be STRICTLY greater than active.ValidFrom.
+        IF @ActiveId IS NOT NULL AND @ValidFrom <= @ActiveValidFrom
+        BEGIN
+            ROLLBACK;
+            THROW 50409, 'ChargeableCharConfigForwardOnly: new ValidFrom must be > active.ValidFrom', 1;
+        END
+
+        -- Close the current vigente: ValidTo = new ValidFrom - 1 day.
+        IF @ActiveId IS NOT NULL
+        BEGIN
+            UPDATE dbo.ChargeableCharConfig
+               SET ValidTo = DATEADD(DAY, -1, @ValidFrom)
+             WHERE Id = @ActiveId;
+            SET @ClosedId = @ActiveId;
+        END
+        ELSE
+            SET @ClosedId = NULL;
+
+        -- Insert the new vigente.
+        INSERT INTO dbo.ChargeableCharConfig
+            (ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive)
+        VALUES
+            (@ProductTypeId, @Symbol, @Category, @PricePerUnit, @ValidFrom, NULL, 1);
+        SET @NewId = SCOPE_IDENTITY();
+
+        COMMIT TRANSACTION;
+    END TRY
+    BEGIN CATCH
+        IF XACT_STATE() <> 0 ROLLBACK TRANSACTION;
+        THROW;
+    END CATCH
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- SP: drop old GetActiveForMedio (renamed to GetActiveForProductType)
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_GetActiveForMedio', 'P') IS NOT NULL
+BEGIN
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_GetActiveForMedio;
+    PRINT 'V023: usp_ChargeableCharConfig_GetActiveForMedio dropped.';
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- SP: usp_ChargeableCharConfig_GetActiveForProductType
+--     Resolución per-ProductType + global fallback: 1 fila por Symbol.
+--     CTE + ROW_NUMBER PARTITION BY Symbol ORDER BY per-PT(0) vs global(1).
+--     @ProductTypeId: the specific product type to resolve for.
+--     @AsOfDate: resolve active rows as of this date (for pricing snapshot).
+-- ═══════════════════════════════════════════════════════════════════════
+
+CREATE PROCEDURE dbo.usp_ChargeableCharConfig_GetActiveForProductType
+    @ProductTypeId INT,
+    @AsOfDate      DATE
+AS
+BEGIN
+    SET NOCOUNT ON;
+    WITH Candidates AS (
+        SELECT
+            Id, ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive,
+            ROW_NUMBER() OVER (
+                PARTITION BY Symbol
+                ORDER BY
+                    CASE WHEN ProductTypeId = @ProductTypeId THEN 0 ELSE 1 END, -- prefer specific over global
+                    ValidFrom DESC
+            ) AS rn
+        FROM dbo.ChargeableCharConfig
+        WHERE IsActive   = 1
+          AND ValidFrom <= @AsOfDate
+          AND (ValidTo IS NULL OR ValidTo >= @AsOfDate)
+          AND (ProductTypeId = @ProductTypeId OR ProductTypeId IS NULL)
+    )
+    SELECT Id, ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive
+    FROM   Candidates
+    WHERE  rn = 1;
+END
+GO
+
+-- ═══════════════════════════════════════════════════════════════════════
+-- SP: usp_ChargeableCharConfig_ReactivateWithGuard (NEW — feature 3 of scope delta)
+--     Opción A+guard: literal undo of the last close for (ProductTypeId, Symbol).
+--     Guards:
+--       - Row must exist → THROW 50404
+--       - Row must be closed (ValidTo IS NOT NULL, IsActive = 0) → THROW 50410 if already active
+--       - No vigente currently exists for (ProductTypeId, Symbol) → THROW 50411
+--       - No posterior rows exist for (ProductTypeId, Symbol) → THROW 50412
+--     On success: UPDATE IsActive = 1, ValidTo = NULL (literal undo).
+--     Preserves forward-only invariant and maintains clean history.
+-- ═══════════════════════════════════════════════════════════════════════
+
+IF OBJECT_ID('dbo.usp_ChargeableCharConfig_ReactivateWithGuard', 'P') IS NOT NULL
+    DROP PROCEDURE dbo.usp_ChargeableCharConfig_ReactivateWithGuard;
+GO
+
+CREATE PROCEDURE dbo.usp_ChargeableCharConfig_ReactivateWithGuard
+    @Id BIGINT
+AS
+BEGIN
+    SET NOCOUNT ON;
+    SET XACT_ABORT ON;
+    SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
+
+    BEGIN TRY
+        BEGIN TRANSACTION;
+
+        -- Step 1: Lock + load target row.
+        DECLARE @ProductTypeId INT, @Symbol NVARCHAR(4), @ValidTo DATE, @IsActive BIT;
+        SELECT @ProductTypeId = ProductTypeId,
+               @Symbol        = Symbol,
+               @ValidTo       = ValidTo,
+               @IsActive      = IsActive
+          FROM dbo.ChargeableCharConfig WITH (UPDLOCK, HOLDLOCK)
+         WHERE Id = @Id;
+
+        IF @@ROWCOUNT = 0
+        BEGIN
+            ROLLBACK TRANSACTION;
+            THROW 50404, 'ChargeableCharConfig row not found', 1;
+        END
+
+        -- Step 2: Row must be closed (ValidTo IS NOT NULL and IsActive = 0).
+        --         If it is currently active (ValidTo IS NULL), reactivation is nonsensical.
+        IF @ValidTo IS NULL
+        BEGIN
+            ROLLBACK TRANSACTION;
+            THROW 50410, 'Row is already active — reactivation not needed', 1;
+        END
+
+        -- Step 3: GUARD — no vigente currently for (ProductTypeId, Symbol).
+        --         Prevents re-opening a row while another is already vigente.
+        IF EXISTS (
+            SELECT 1 FROM dbo.ChargeableCharConfig
+             WHERE ((ProductTypeId = @ProductTypeId) OR (ProductTypeId IS NULL AND @ProductTypeId IS NULL))
+               AND Symbol  = @Symbol
+               AND ValidTo IS NULL
+        )
+        BEGIN
+            ROLLBACK TRANSACTION;
+            THROW 50411, 'A current active row already exists for this ProductType/Symbol — cannot reactivate', 1;
+        END
+
+        -- Step 4: GUARD — no posterior rows exist for (ProductTypeId, Symbol) after @ValidTo.
+        --         Ensures this is the LAST closed row; reactivating an older row would violate
+        --         forward-only ordering of the temporal chain.
+        IF EXISTS (
+            SELECT 1 FROM dbo.ChargeableCharConfig
+             WHERE ((ProductTypeId = @ProductTypeId) OR (ProductTypeId IS NULL AND @ProductTypeId IS NULL))
+               AND Symbol    = @Symbol
+               AND ValidFrom > @ValidTo
+               AND Id        <> @Id
+        )
+        BEGIN
+            ROLLBACK TRANSACTION;
+            THROW 50412, 'Posterior rows exist for this ProductType/Symbol — reactivation not allowed', 1;
+        END
+
+        -- Step 5: Literal undo — re-open the row.
+        UPDATE dbo.ChargeableCharConfig
+           SET IsActive = 1,
+               ValidTo  = NULL
+         WHERE Id = @Id;
+
+        COMMIT TRANSACTION;
+    END TRY
+    BEGIN CATCH
+        IF XACT_STATE() <> 0 ROLLBACK TRANSACTION;
+        THROW;
+    END CATCH
+END
+GO
+
+PRINT '';
+PRINT 'V023 applied — ChargeableCharConfig refactored to ProductType model:';
+PRINT '  - MedioId dropped, ProductTypeId added (FK to dbo.ProductType)';
+PRINT '  - UX_ChargeableCharConfig_Vigente + IX_ChargeableCharConfig_Query recreated';
+PRINT '  - usp_ChargeableCharConfig_InsertWithClose: @MedioId → @ProductTypeId';
+PRINT '  - usp_ChargeableCharConfig_GetActiveForMedio dropped';
+PRINT '  - usp_ChargeableCharConfig_GetActiveForProductType created';
+PRINT '  - usp_ChargeableCharConfig_ReactivateWithGuard created (NEW)';
+PRINT '  - CK_Price_Positive replaced by CK_Price_NonNegative (>= 0 for opt-in billing)';
+PRINT 'Next migration: V024 (reseed global rows with PricePerUnit = 0.0000).';
+GO

database/migrations/V024_ROLLBACK.sql

@@ -0,0 +1,22 @@
+-- V024_ROLLBACK.sql
+-- PRC-001: Reversa de V024__reseed_global_with_zero_price.sql.
+--
+-- Restaura las 4 filas globales de seed a PricePerUnit = 1.0000 (valor original de V022).
+-- Solo ejecutar si V024 fue aplicado y se desea volver al estado previo.
+--
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+UPDATE dbo.ChargeableCharConfig
+   SET PricePerUnit = CAST(1.0000 AS DECIMAL(18,4))
+ WHERE ProductTypeId IS NULL
+   AND Symbol IN (N'$', N'%', N'!', N'¡')
+   AND ValidTo IS NULL;
+
+PRINT 'V024 ROLLBACK complete — global ChargeableCharConfig prices restored to 1.0000.';
+PRINT 'Rows updated: ' + CAST(@@ROWCOUNT AS NVARCHAR(10));
+GO

database/migrations/V024__reseed_global_with_zero_price.sql

@@ -0,0 +1,34 @@
+-- V024__reseed_global_with_zero_price.sql
+-- PRC-001 scope delta: actualiza las 4 filas globales de seed a PricePerUnit = 0.0000.
+--
+-- Cambios:
+--   1. UPDATE directo de las 4 filas globales vigentes ($, %, !, ¡) a PricePerUnit = 0.0000.
+--
+-- Decisión: UPDATE directo (no forward-only close+insert) porque:
+--   - V022 seed price 1.0000 era siempre un placeholder nunca usado en lógica de negocio.
+--   - No existe historial de facturación con el valor 1.0000.
+--   - La semántica correcta es "opt-in billing": por defecto ningún tipo cobra especiales.
+--   - La forward-only invariante aplica a cambios de precio en producción; este es un fix
+--     de seed pre-go-live dentro de la misma branch feature (no mergeada a main aún).
+--   See: scope-delta-1 en engram sdd/prc-001-word-counter-spike/scope-delta-1.
+--
+-- Patrón: UPDATE simple WHERE ProductTypeId IS NULL AND Symbol IN (...) AND ValidTo IS NULL.
+-- Idempotente: UPDATE idempotente (re-ejecutar no cambia el resultado).
+-- Reversa: V024_ROLLBACK.sql.
+-- Depends on: V023 (ProductTypeId column must exist; CK_Price_NonNegative >= 0 required).
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+UPDATE dbo.ChargeableCharConfig
+   SET PricePerUnit = CAST(0.0000 AS DECIMAL(18,4))
+ WHERE ProductTypeId IS NULL
+   AND Symbol IN (N'$', N'%', N'!', N'¡')
+   AND ValidTo IS NULL;
+
+PRINT 'V024 applied — global ChargeableCharConfig prices reset to 0.0000 (opt-in billing).';
+PRINT 'Rows updated: ' + CAST(@@ROWCOUNT AS NVARCHAR(10));
+GO

database/migrations/V025_ROLLBACK.sql

@@ -0,0 +1,20 @@
+-- V025_ROLLBACK.sql
+-- Reversa de V025 — elimina los overrides demo de ChargeableCharConfig.
+-- Los globales V022/V024 (ProductTypeId IS NULL) NO se tocan.
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+DELETE FROM dbo.ChargeableCharConfig
+ WHERE ProductTypeId IS NOT NULL
+   AND ValidTo IS NULL
+   AND Symbol IN (N'$', N'%', N'!', N'¡')
+   AND ProductTypeId IN (
+       SELECT Id FROM dbo.ProductType
+        WHERE Nombre IN ('Clasificado', 'Notables', 'Fúnebres', 'Funebres')
+   );
+
+PRINT 'V025 rolled back — demo overrides eliminated. Globales V022/V024 preservados.';
+GO

database/migrations/V025__seed_chargeable_char_overrides_demo.sql

@@ -0,0 +1,101 @@
+-- V025__seed_chargeable_char_overrides_demo.sql
+-- PRC-001 followup #54: seeders de demo con valores ficticios per-ProductType.
+--
+-- Estrategia:
+--   1. Los 4 globales de V022+V024 quedan en 0.0000 (opt-in billing baseline).
+--   2. Para ProductTypes conocidos del roadmap (Clasificado, Notables, Fúnebres),
+--      inserta overrides con precios ficticios coherentes con datos de demo del resto
+--      del proyecto. Si el ProductType no existe, el bloque correspondiente no hace nada.
+--   3. Cuando PRD-008 seede los 12 tipos legacy, V025 puede re-aplicarse y creará
+--      los overrides que falten (MERGE idempotente).
+--
+-- Precios ficticios (placeholders de demo — NO son tarifas reales):
+--   Clasificado:   $ = 5.0000, % = 3.0000, ! = 2.0000, ¡ = 2.0000
+--   Notables:      $ = 8.0000, % = 5.0000, ! = 4.0000, ¡ = 4.0000
+--   Fúnebres:      $ = 6.0000, % = 4.0000, ! = 3.5000, ¡ = 3.5000
+--
+-- Reversa: V025_ROLLBACK.sql (elimina los overrides demo dejando solo los globales V022/V024).
+-- Run on: SIGCM2 (dev), SIGCM2_Test_App, SIGCM2_Test_Api.
+-- Idempotente: usa MERGE por (ProductTypeId, Symbol, ValidTo IS NULL).
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+DECLARE @ClasificadoId INT = (SELECT TOP 1 Id FROM dbo.ProductType WHERE Nombre = 'Clasificado' AND IsActive = 1);
+DECLARE @NotablesId    INT = (SELECT TOP 1 Id FROM dbo.ProductType WHERE Nombre = 'Notables'    AND IsActive = 1);
+DECLARE @FunebresId    INT = (SELECT TOP 1 Id FROM dbo.ProductType WHERE Nombre IN ('Fúnebres','Funebres') AND IsActive = 1);
+
+DECLARE @DemoValidFrom DATE = '2026-01-01';
+
+-- Clasificado overrides
+IF @ClasificadoId IS NOT NULL
+BEGIN
+    MERGE dbo.ChargeableCharConfig AS t
+    USING (VALUES
+        (@ClasificadoId, N'$', N'Currency',    CAST(5.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@ClasificadoId, N'%', N'Percentage',  CAST(3.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@ClasificadoId, N'!', N'Exclamation', CAST(2.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@ClasificadoId, N'¡', N'Exclamation', CAST(2.0000 AS DECIMAL(18,4)), @DemoValidFrom)
+    ) AS s (ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom)
+    ON (t.ProductTypeId = s.ProductTypeId AND t.Symbol = s.Symbol AND t.ValidTo IS NULL)
+    WHEN NOT MATCHED THEN
+        INSERT (ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive)
+        VALUES (s.ProductTypeId, s.Symbol, s.Category, s.PricePerUnit, s.ValidFrom, NULL, 1);
+    PRINT 'V025: Clasificado overrides seeded (ProductTypeId=' + CAST(@ClasificadoId AS NVARCHAR(10)) + ').';
+END
+ELSE
+    PRINT 'V025: ProductType "Clasificado" not found — skipping Clasificado overrides.';
+GO
+
+DECLARE @NotablesId INT = (SELECT TOP 1 Id FROM dbo.ProductType WHERE Nombre = 'Notables' AND IsActive = 1);
+DECLARE @DemoValidFrom DATE = '2026-01-01';
+
+-- Notables overrides
+IF @NotablesId IS NOT NULL
+BEGIN
+    MERGE dbo.ChargeableCharConfig AS t
+    USING (VALUES
+        (@NotablesId, N'$', N'Currency',    CAST(8.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@NotablesId, N'%', N'Percentage',  CAST(5.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@NotablesId, N'!', N'Exclamation', CAST(4.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@NotablesId, N'¡', N'Exclamation', CAST(4.0000 AS DECIMAL(18,4)), @DemoValidFrom)
+    ) AS s (ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom)
+    ON (t.ProductTypeId = s.ProductTypeId AND t.Symbol = s.Symbol AND t.ValidTo IS NULL)
+    WHEN NOT MATCHED THEN
+        INSERT (ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive)
+        VALUES (s.ProductTypeId, s.Symbol, s.Category, s.PricePerUnit, s.ValidFrom, NULL, 1);
+    PRINT 'V025: Notables overrides seeded (ProductTypeId=' + CAST(@NotablesId AS NVARCHAR(10)) + ').';
+END
+ELSE
+    PRINT 'V025: ProductType "Notables" not found — skipping Notables overrides.';
+GO
+
+DECLARE @FunebresId INT = (SELECT TOP 1 Id FROM dbo.ProductType WHERE Nombre IN ('Fúnebres','Funebres') AND IsActive = 1);
+DECLARE @DemoValidFrom DATE = '2026-01-01';
+
+-- Fúnebres overrides
+IF @FunebresId IS NOT NULL
+BEGIN
+    MERGE dbo.ChargeableCharConfig AS t
+    USING (VALUES
+        (@FunebresId, N'$', N'Currency',    CAST(6.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@FunebresId, N'%', N'Percentage',  CAST(4.0000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@FunebresId, N'!', N'Exclamation', CAST(3.5000 AS DECIMAL(18,4)), @DemoValidFrom),
+        (@FunebresId, N'¡', N'Exclamation', CAST(3.5000 AS DECIMAL(18,4)), @DemoValidFrom)
+    ) AS s (ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom)
+    ON (t.ProductTypeId = s.ProductTypeId AND t.Symbol = s.Symbol AND t.ValidTo IS NULL)
+    WHEN NOT MATCHED THEN
+        INSERT (ProductTypeId, Symbol, Category, PricePerUnit, ValidFrom, ValidTo, IsActive)
+        VALUES (s.ProductTypeId, s.Symbol, s.Category, s.PricePerUnit, s.ValidFrom, NULL, 1);
+    PRINT 'V025: Fúnebres overrides seeded (ProductTypeId=' + CAST(@FunebresId AS NVARCHAR(10)) + ').';
+END
+ELSE
+    PRINT 'V025: ProductType "Fúnebres/Funebres" not found — skipping Fúnebres overrides.';
+GO
+
+PRINT '';
+PRINT 'V025 applied — demo overrides (fictitious prices) seeded for ProductTypes: Clasificado, Notables, Fúnebres (only where they exist).';
+PRINT 'NOTE: Los 4 globales (V022/V024) quedan intactos en 0.0000. Estos overrides son PLACEHOLDERS DE DEMO — reemplazar antes de go-live.';
+GO

src/api/SIGCM2.Api/Controllers/ChargeableCharConfigController.cs

@@ -0,0 +1,247 @@
+using FluentValidation;
+using Microsoft.AspNetCore.Mvc;
+using SIGCM2.Api.Authorization;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Common;
+using SIGCM2.Application.Pricing.ChargeableChars;
+using SIGCM2.Application.Pricing.ChargeableChars.Create;
+using SIGCM2.Application.Pricing.ChargeableChars.Deactivate;
+using SIGCM2.Application.Pricing.ChargeableChars.Delete;
+using SIGCM2.Application.Pricing.ChargeableChars.GetById;
+using SIGCM2.Application.Pricing.ChargeableChars.List;
+using SIGCM2.Application.Pricing.ChargeableChars.Reactivate;
+using SIGCM2.Application.Pricing.ChargeableChars.SchedulePrice;
+
+namespace SIGCM2.Api.Controllers;
+
+/// <summary>
+/// PRC-001: Admin endpoints for ChargeableCharConfig management.
+/// All endpoints require 'tasacion:caracteres_especiales:gestionar'.
+/// Route base: api/v1/admin/chargeable-chars
+/// </summary>
+[ApiController]
+[Route("api/v1/admin/chargeable-chars")]
+public sealed class ChargeableCharConfigController : ControllerBase
+{
+    private readonly IDispatcher _dispatcher;
+    private readonly IValidator<CreateChargeableCharConfigCommand> _createValidator;
+    private readonly IValidator<SchedulePriceChangeCommand> _scheduleValidator;
+
+    public ChargeableCharConfigController(
+        IDispatcher dispatcher,
+        IValidator<CreateChargeableCharConfigCommand> createValidator,
+        IValidator<SchedulePriceChangeCommand> scheduleValidator)
+    {
+        _dispatcher = dispatcher;
+        _createValidator = createValidator;
+        _scheduleValidator = scheduleValidator;
+    }
+
+    // ── GET /api/v1/admin/chargeable-chars ────────────────────────────────────
+
+    /// <summary>
+    /// Returns a paginated list of ChargeableCharConfig rows.
+    /// Filters: productTypeId (optional, long?), activeOnly (bool, default true).
+    /// Pagination: skip/take model mapped to page/pageSize — or use page/pageSize directly.
+    /// Defaults: page=1, pageSize=20. Clamped: pageSize max 200.
+    /// </summary>
+    [HttpGet]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(PagedResult<ChargeableCharConfigDto>), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<IActionResult> List(
+        [FromQuery] long? productTypeId,
+        [FromQuery] bool activeOnly = true,
+        [FromQuery] int? page = null,
+        [FromQuery] int? pageSize = null,
+        [FromQuery] int? skip = null,
+        [FromQuery] int? take = null)
+    {
+        // Support both page/pageSize and skip/take query patterns
+        int resolvedPage;
+        int resolvedPageSize;
+
+        if (skip is not null || take is not null)
+        {
+            // Convert skip/take to page/pageSize
+            resolvedPageSize = Math.Min(take ?? 50, 200);
+            resolvedPage = resolvedPageSize > 0
+                ? ((skip ?? 0) / resolvedPageSize) + 1
+                : 1;
+        }
+        else
+        {
+            resolvedPage = page ?? 1;
+            resolvedPageSize = Math.Min(pageSize ?? 20, 200);
+        }
+
+        var query = new ListChargeableCharConfigQuery(productTypeId, activeOnly, resolvedPage, resolvedPageSize);
+        var result = await _dispatcher.Send<ListChargeableCharConfigQuery, PagedResult<ChargeableCharConfigDto>>(query);
+        return Ok(result);
+    }
+
+    // ── GET /api/v1/admin/chargeable-chars/{id} ───────────────────────────────
+
+    /// <summary>
+    /// Returns a single ChargeableCharConfig by Id. Returns 404 if not found.
+    /// </summary>
+    [HttpGet("{id:long}")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(ChargeableCharConfigDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> GetById([FromRoute] long id)
+    {
+        var result = await _dispatcher.Send<GetChargeableCharConfigByIdQuery, ChargeableCharConfigDto?>(
+            new GetChargeableCharConfigByIdQuery(id));
+        return result is null ? NotFound() : Ok(result);
+    }
+
+    // ── POST /api/v1/admin/chargeable-chars ───────────────────────────────────
+
+    /// <summary>
+    /// Creates a new ChargeableCharConfig row. Closes the current active row for (ProductTypeId, Symbol) if one exists.
+    /// Returns 201 Created with Location header pointing to GET /{id}.
+    /// </summary>
+    [HttpPost]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(CreateChargeableCharConfigResponse), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Create([FromBody] CreateChargeableCharConfigRequest request)
+    {
+        var command = new CreateChargeableCharConfigCommand(
+            request.ProductTypeId,
+            request.Symbol,
+            request.Category,
+            request.PricePerUnit,
+            request.ValidFrom);
+
+        var validation = await _createValidator.ValidateAsync(command);
+        if (!validation.IsValid)
+        {
+            var errors = validation.Errors
+                .GroupBy(e => e.PropertyName)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+            return BadRequest(new { errors });
+        }
+
+        var result = await _dispatcher.Send<CreateChargeableCharConfigCommand, CreateChargeableCharConfigResponse>(command);
+        return CreatedAtAction(nameof(GetById), new { id = result.Id }, result);
+    }
+
+    // ── PUT /api/v1/admin/chargeable-chars/{id}/price ────────────────────────
+
+    /// <summary>
+    /// Schedules a price change for an existing ChargeableCharConfig.
+    /// Closes the current active row and opens a new one with the new price + ValidFrom.
+    /// ValidFrom must be strictly greater than the existing row's ValidFrom (forward-only).
+    /// </summary>
+    [HttpPut("{id:long}/price")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(SchedulePriceChangeResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> SchedulePriceChange(
+        [FromRoute] long id,
+        [FromBody] SchedulePriceChangeRequest request)
+    {
+        var command = new SchedulePriceChangeCommand(id, request.PricePerUnit, request.ValidFrom);
+
+        var validation = await _scheduleValidator.ValidateAsync(command);
+        if (!validation.IsValid)
+        {
+            var errors = validation.Errors
+                .GroupBy(e => e.PropertyName)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+            return BadRequest(new { errors });
+        }
+
+        var result = await _dispatcher.Send<SchedulePriceChangeCommand, SchedulePriceChangeResponse>(command);
+        return Ok(result);
+    }
+
+    // ── PATCH /api/v1/admin/chargeable-chars/{id}/deactivate ─────────────────
+
+    /// <summary>
+    /// Deactivates a ChargeableCharConfig row (sets IsActive=false, ValidTo=today_AR).
+    /// Idempotent: calling on an already-inactive row is a no-op.
+    /// </summary>
+    [HttpPatch("{id:long}/deactivate")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(DeactivateChargeableCharConfigResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    public async Task<IActionResult> Deactivate([FromRoute] long id)
+    {
+        var result = await _dispatcher.Send<DeactivateChargeableCharConfigCommand, DeactivateChargeableCharConfigResponse>(
+            new DeactivateChargeableCharConfigCommand(id));
+        return Ok(result);
+    }
+
+    // ── PATCH /api/v1/admin/chargeable-chars/{id}/reactivate ─────────────────
+
+    /// <summary>
+    /// Reactivates a previously closed ChargeableCharConfig row (undo last deactivation).
+    /// Guard rules (enforced by SP):
+    ///   - ALREADY_ACTIVE: target row is already active → 409
+    ///   - VIGENTE_EXISTS: a different active row exists for (ProductTypeId, Symbol) → 409
+    ///   - POSTERIOR_ROWS_EXIST: rows with higher ValidFrom exist after the target → 409
+    /// </summary>
+    [HttpPatch("{id:long}/reactivate")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(ReactivateChargeableCharConfigResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> Reactivate([FromRoute] long id)
+    {
+        var result = await _dispatcher.Send<ReactivateChargeableCharConfigCommand, ReactivateChargeableCharConfigResponse>(
+            new ReactivateChargeableCharConfigCommand(id));
+        return Ok(result);
+    }
+
+    // ── DELETE /api/v1/admin/chargeable-chars/{id} ───────────────────────────
+
+    /// <summary>
+    /// Deletes a ChargeableCharConfig row.
+    /// NOTE: With SYSTEM_VERSIONING ON, the row is moved to the history table (temporal audit preserved).
+    /// The row disappears from all current-state queries.
+    /// Guard for "used in invoicing" is deferred to FAC-001 followup issue.
+    /// Returns 200 + { id } consistent with the Deactivate pattern.
+    /// </summary>
+    [HttpDelete("{id:long}")]
+    [RequirePermission("tasacion:caracteres_especiales:gestionar")]
+    [ProducesResponseType(typeof(DeleteChargeableCharConfigResponse), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> Delete([FromRoute] long id)
+    {
+        var result = await _dispatcher.Send<DeleteChargeableCharConfigCommand, DeleteChargeableCharConfigResponse>(
+            new DeleteChargeableCharConfigCommand(id));
+        return Ok(result);
+    }
+}
+
+// ── Request body records ──────────────────────────────────────────────────────
+
+/// <summary>PRC-001: Create ChargeableCharConfig request body.</summary>
+public sealed record CreateChargeableCharConfigRequest(
+    long? ProductTypeId,
+    string Symbol,
+    string Category,
+    decimal PricePerUnit,
+    DateOnly ValidFrom);
+
+/// <summary>PRC-001: Schedule price change request body.</summary>
+public sealed record SchedulePriceChangeRequest(
+    decimal PricePerUnit,
+    DateOnly ValidFrom);

src/api/SIGCM2.Api/Controllers/ProductPricesController.cs

@@ -0,0 +1,102 @@
+using FluentValidation;
+using Microsoft.AspNetCore.Mvc;
+using SIGCM2.Api.Authorization;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Common;
+using SIGCM2.Application.Products.Prices;
+using SIGCM2.Application.Products.Prices.AddPrice;
+using SIGCM2.Application.Products.Prices.GetHistory;
+
+namespace SIGCM2.Api.Controllers;
+
+/// <summary>
+/// PRD-003: ProductPrices historic pricing management.
+/// Read endpoint at GET /api/v1/products/{id}/prices — requires 'catalogo:productos:gestionar'.
+/// Write endpoint at POST /api/v1/admin/products/{id}/prices — requires 'catalogo:productos:gestionar'.
+/// </summary>
+[ApiController]
+public sealed class ProductPricesController : ControllerBase
+{
+    private readonly IDispatcher _dispatcher;
+    private readonly IValidator<AddProductPriceCommand> _addValidator;
+
+    public ProductPricesController(
+        IDispatcher dispatcher,
+        IValidator<AddProductPriceCommand> addValidator)
+    {
+        _dispatcher = dispatcher;
+        _addValidator = addValidator;
+    }
+
+    // ── READ endpoint ──────────────────────────────────────────────────────────
+
+    /// <summary>
+    /// Returns a paginated page of price history for a Product, ordered descending by PriceValidFrom.
+    /// Defaults: page=1, pageSize=20. Clamping: page ≥ 1, pageSize ∈ [1, 100].
+    /// Returns 200 with empty items if the product has no prices yet or page is beyond total.
+    /// Returns 404 if the product does not exist.
+    /// Returns 401 if not authenticated, 403 if missing 'catalogo:productos:gestionar' permission.
+    /// </summary>
+    [HttpGet("api/v1/products/{id:int}/prices")]
+    [RequirePermission("catalogo:productos:gestionar")]
+    [ProducesResponseType(typeof(PagedResult<ProductPriceDto>), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> GetProductPrices(
+        [FromRoute] int id,
+        [FromQuery] int? page,
+        [FromQuery] int? pageSize)
+    {
+        var query = new GetProductPricesQuery(
+            ProductId: id,
+            Page: page ?? 1,
+            PageSize: pageSize ?? 20);
+        var result = await _dispatcher.Send<GetProductPricesQuery, PagedResult<ProductPriceDto>>(query);
+        return Ok(result);
+    }
+
+    // ── WRITE endpoint ─────────────────────────────────────────────────────────
+
+    /// <summary>
+    /// Adds a new price to a Product. Closes the current active price if one exists.
+    /// PriceValidFrom must be >= today_AR and strictly greater than the active price's PriceValidFrom.
+    /// Returns 201 Created with Location header pointing to GET /api/v1/products/{id}/prices.
+    /// </summary>
+    [HttpPost("api/v1/admin/products/{id:int}/prices")]
+    [RequirePermission("catalogo:productos:gestionar")]
+    [ProducesResponseType(typeof(AddProductPriceResponse), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    public async Task<IActionResult> AddProductPrice(
+        [FromRoute] int id,
+        [FromBody] AddProductPriceRequest request)
+    {
+        var command = new AddProductPriceCommand(
+            ProductId: id,
+            Price: request.Price,
+            PriceValidFrom: request.PriceValidFrom);
+
+        var validation = await _addValidator.ValidateAsync(command);
+        if (!validation.IsValid)
+        {
+            var errors = validation.Errors
+                .GroupBy(e => e.PropertyName)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+            return BadRequest(new { errors });
+        }
+
+        var result = await _dispatcher.Send<AddProductPriceCommand, AddProductPriceResponse>(command);
+        return CreatedAtAction(nameof(GetProductPrices), new { id }, result);
+    }
+}
+
+// ── Request body record ───────────────────────────────────────────────────────
+
+/// <summary>PRD-003: Add ProductPrice request body.</summary>
+public sealed record AddProductPriceRequest(
+    decimal Price,
+    DateOnly PriceValidFrom);

src/api/SIGCM2.Api/Controllers/ProductsController.cs

@@ -0,0 +1,169 @@
+using FluentValidation;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using SIGCM2.Api.Authorization;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Common;
+using SIGCM2.Application.Products.Create;
+using SIGCM2.Application.Products.Deactivate;
+using SIGCM2.Application.Products.GetById;
+using SIGCM2.Application.Products.List;
+using SIGCM2.Application.Products.Update;
+
+namespace SIGCM2.Api.Controllers;
+
+/// <summary>
+/// PRD-002: Product catalog management.
+/// Read endpoints at /api/v1/products — require authentication (any role).
+/// Write endpoints at /api/v1/admin/products — require 'catalogo:productos:gestionar'.
+/// </summary>
+[ApiController]
+public sealed class ProductsController : ControllerBase
+{
+    private readonly IDispatcher _dispatcher;
+    private readonly IValidator<CreateProductCommand> _createValidator;
+    private readonly IValidator<UpdateProductCommand> _updateValidator;
+
+    public ProductsController(
+        IDispatcher dispatcher,
+        IValidator<CreateProductCommand> createValidator,
+        IValidator<UpdateProductCommand> updateValidator)
+    {
+        _dispatcher = dispatcher;
+        _createValidator = createValidator;
+        _updateValidator = updateValidator;
+    }
+
+    // ── READ endpoints ─────────────────────────────────────────────────────────
+
+    /// <summary>Returns a paginated list of Products. Requires authentication.</summary>
+    [HttpGet("api/v1/products")]
+    [Authorize]
+    [ProducesResponseType(typeof(PagedResult<ProductListItemDto>), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    public async Task<IActionResult> ListProducts(
+        [FromQuery] int page = 1,
+        [FromQuery] int pageSize = 20,
+        [FromQuery] bool? activo = true,
+        [FromQuery] string? search = null,
+        [FromQuery] int? medioId = null,
+        [FromQuery] int? productTypeId = null,
+        [FromQuery] int? rubroId = null)
+    {
+        var query = new ListProductsQuery(page, pageSize, activo, search, medioId, productTypeId, rubroId);
+        var result = await _dispatcher.Send<ListProductsQuery, PagedResult<ProductListItemDto>>(query);
+        return Ok(result);
+    }
+
+    /// <summary>Returns a single Product by id. Requires authentication.</summary>
+    [HttpGet("api/v1/products/{id:int}")]
+    [Authorize]
+    [ProducesResponseType(typeof(ProductDetailDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> GetProductById([FromRoute] int id)
+    {
+        var query = new GetProductByIdQuery(id);
+        var result = await _dispatcher.Send<GetProductByIdQuery, ProductDetailDto>(query);
+        return Ok(result);
+    }
+
+    // ── WRITE endpoints ────────────────────────────────────────────────────────
+
+    /// <summary>Creates a new Product. Requires catalogo:productos:gestionar.</summary>
+    [HttpPost("api/v1/admin/products")]
+    [RequirePermission("catalogo:productos:gestionar")]
+    [ProducesResponseType(typeof(ProductCreatedDto), StatusCodes.Status201Created)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<IActionResult> CreateProduct([FromBody] CreateProductRequest request)
+    {
+        var command = new CreateProductCommand(
+            Nombre: request.Nombre ?? string.Empty,
+            MedioId: request.MedioId,
+            ProductTypeId: request.ProductTypeId,
+            RubroId: request.RubroId,
+            BasePrice: request.BasePrice,
+            PriceDurationDays: request.PriceDurationDays);
+
+        var validation = await _createValidator.ValidateAsync(command);
+        if (!validation.IsValid)
+        {
+            var errors = validation.Errors
+                .GroupBy(e => e.PropertyName)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+            return BadRequest(new { errors });
+        }
+
+        var result = await _dispatcher.Send<CreateProductCommand, ProductCreatedDto>(command);
+        return CreatedAtAction(nameof(GetProductById), new { id = result.Id }, result);
+    }
+
+    /// <summary>Updates a Product. Requires catalogo:productos:gestionar.</summary>
+    [HttpPut("api/v1/admin/products/{id:int}")]
+    [RequirePermission("catalogo:productos:gestionar")]
+    [ProducesResponseType(typeof(ProductUpdatedDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status400BadRequest)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<IActionResult> UpdateProduct([FromRoute] int id, [FromBody] UpdateProductRequest request)
+    {
+        var command = new UpdateProductCommand(
+            Id: id,
+            Nombre: request.Nombre ?? string.Empty,
+            RubroId: request.RubroId,
+            BasePrice: request.BasePrice,
+            PriceDurationDays: request.PriceDurationDays);
+
+        var validation = await _updateValidator.ValidateAsync(command);
+        if (!validation.IsValid)
+        {
+            var errors = validation.Errors
+                .GroupBy(e => e.PropertyName)
+                .ToDictionary(g => g.Key, g => g.Select(e => e.ErrorMessage).ToArray());
+            return BadRequest(new { errors });
+        }
+
+        var result = await _dispatcher.Send<UpdateProductCommand, ProductUpdatedDto>(command);
+        return Ok(result);
+    }
+
+    /// <summary>Soft-deletes (deactivates) a Product. Requires catalogo:productos:gestionar.</summary>
+    [HttpDelete("api/v1/admin/products/{id:int}")]
+    [RequirePermission("catalogo:productos:gestionar")]
+    [ProducesResponseType(StatusCodes.Status204NoContent)]
+    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
+    [ProducesResponseType(StatusCodes.Status403Forbidden)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    public async Task<IActionResult> DeactivateProduct([FromRoute] int id)
+    {
+        var command = new DeactivateProductCommand(id);
+        await _dispatcher.Send<DeactivateProductCommand, ProductStatusDto>(command);
+        return NoContent();
+    }
+}
+
+// ── Request body records ──────────────────────────────────────────────────────
+
+/// <summary>PRD-002: Create Product request body.</summary>
+public sealed record CreateProductRequest(
+    string? Nombre,
+    int MedioId = 0,
+    int ProductTypeId = 0,
+    int? RubroId = null,
+    decimal BasePrice = 0m,
+    int? PriceDurationDays = null);
+
+/// <summary>PRD-002: Update Product request body.</summary>
+public sealed record UpdateProductRequest(
+    string? Nombre,
+    int? RubroId = null,
+    decimal BasePrice = 0m,
+    int? PriceDurationDays = null);

src/api/SIGCM2.Api/Filters/ExceptionFilter.cs

@@ -3,6 +3,7 @@ using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.Filters;
 using Microsoft.Data.SqlClient;
 using SIGCM2.Domain.Exceptions;
+using SIGCM2.Domain.Pricing.Exceptions;
 
 namespace SIGCM2.Api.Filters;
 
@@ -267,6 +268,18 @@ public sealed class ExceptionFilter : IExceptionFilter
                 context.ExceptionHandled = true;
                 break;
 
+            case RubroConProductosActivosException rubroProductosEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "rubro_con_productos_activos",
+                    message = rubroProductosEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
             // ADM-001: Medio exceptions
             case MedioCodigoDuplicadoException medioCodDupEx:
                 context.Result = new ObjectResult(new
@@ -463,6 +476,107 @@ public sealed class ExceptionFilter : IExceptionFilter
                 context.ExceptionHandled = true;
                 break;
 
+            // PRD-003: ProductPrices exceptions
+            case ProductPriceForwardOnlyException forwardOnlyEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "product_price_forward_only",
+                    message = forwardOnlyEx.Message,
+                    productId = forwardOnlyEx.ProductId
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ProductPriceInvalidException priceInvalidEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "product_price_invalid",
+                    message = priceInvalidEx.Message,
+                    field = priceInvalidEx.Field
+                })
+                {
+                    StatusCode = StatusCodes.Status400BadRequest
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ProductSinPrecioActivoException sinPrecioEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "product_sin_precio_activo",
+                    message = sinPrecioEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status404NotFound
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            // PRD-002: Product exceptions
+            case ProductNotFoundException productNotFoundEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "product_not_found",
+                    message = productNotFoundEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status404NotFound
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ProductNombreDuplicadoEnMedioTipoException productDupEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "product_nombre_duplicado",
+                    message = productDupEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ProductTipoFlagsIncoherentesException productFlagsEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "product_flags_incoherentes",
+                    field = productFlagsEx.Field,
+                    message = productFlagsEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status422UnprocessableEntity
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ProductTypeInactivoException productTypeInactivoEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "product_type_inactivo",
+                    message = productTypeInactivoEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case RubroInactivoException rubroInactivoEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "rubro_inactivo",
+                    message = rubroInactivoEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
             // ADM-008: PuntoDeVenta exceptions
             case PuntoDeVentaNotFoundException puntoDeVentaNotFoundEx:
                 context.Result = new ObjectResult(new
@@ -532,6 +646,94 @@ public sealed class ExceptionFilter : IExceptionFilter
                 context.ExceptionHandled = true;
                 break;
 
+            // PRC-001: WordCounter + ChargeableCharConfig exceptions
+            case EmojiDetectedException emojiEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "emoji_not_allowed",
+                    code = "EMOJI_NOT_ALLOWED",
+                    message = emojiEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status400BadRequest
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case WordCountValidationException wordEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "word_count_validation",
+                    code = "WORD_COUNT_VALIDATION",
+                    field = wordEx.Field,
+                    reason = wordEx.Reason,
+                    message = wordEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status400BadRequest
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ChargeableCharConfigInvalidException configInvalidEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "chargeable_char_invalid",
+                    code = "CHARGEABLE_CHAR_INVALID",
+                    field = configInvalidEx.Field,
+                    reason = configInvalidEx.Reason,
+                    message = configInvalidEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status400BadRequest
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ChargeableCharConfigForwardOnlyException forwardOnlyCharEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "chargeable_char_forward_only",
+                    code = "CHARGEABLE_CHAR_FORWARD_ONLY",
+                    productTypeId = forwardOnlyCharEx.ProductTypeId,
+                    symbol = forwardOnlyCharEx.Symbol,
+                    newValidFrom = forwardOnlyCharEx.NewValidFrom,
+                    activeValidFrom = forwardOnlyCharEx.ActiveValidFrom,
+                    message = forwardOnlyCharEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case ChargeableCharConfigReactivationNotAllowedException reactivationEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "chargeable_char_reactivation_not_allowed",
+                    code = "CHARGEABLE_CHAR_REACTIVATION_NOT_ALLOWED",
+                    id = reactivationEx.Id,
+                    reason = reactivationEx.Reason,
+                    message = reactivationEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status409Conflict
+                };
+                context.ExceptionHandled = true;
+                break;
+
+            case KeyNotFoundException keyNotFoundEx:
+                context.Result = new ObjectResult(new
+                {
+                    error = "not_found",
+                    message = keyNotFoundEx.Message
+                })
+                {
+                    StatusCode = StatusCodes.Status404NotFound
+                };
+                context.ExceptionHandled = true;
+                break;
+
             case ValidationException validationEx:
                 var errors = validationEx.Errors
                     .GroupBy(e => e.PropertyName)

src/api/SIGCM2.Application/Abstractions/Persistence/IChargeableCharConfigRepository.cs

@@ -0,0 +1,104 @@
+using SIGCM2.Domain.Pricing.ChargeableChars;
+
+namespace SIGCM2.Application.Abstractions.Persistence;
+
+/// <summary>
+/// PRC-001 — Write + query access to dbo.ChargeableCharConfig.
+/// Implemented by ChargeableCharConfigRepository (Dapper) in Infrastructure.
+///
+/// InsertWithCloseAsync: invokes usp_ChargeableCharConfig_InsertWithClose which atomically
+/// closes any active row for (ProductTypeId, Symbol) and inserts the new row.
+///
+/// GetActiveForProductTypeAsync: invokes usp_ChargeableCharConfig_GetActiveForProductType which
+/// returns both per-ProductType rows AND global (ProductTypeId IS NULL) rows for the given asOfDate.
+/// The Application service applies the per-ProductType > global priority rule.
+/// </summary>
+public interface IChargeableCharConfigRepository
+{
+    /// <summary>
+    /// Invokes usp_ChargeableCharConfig_InsertWithClose inside the ambient TransactionScope.
+    /// Closes any active row matching (ProductTypeId, Symbol) and inserts a new one.
+    /// Returns the Id of the newly inserted row.
+    /// Throws:
+    ///   - ChargeableCharConfigForwardOnlyException on SQL THROW 50409
+    ///   - ChargeableCharConfigInvalidException on SQL THROW 50404 (not-found guard)
+    /// </summary>
+    Task<long> InsertWithCloseAsync(
+        long? productTypeId,
+        string symbol,
+        string category,
+        decimal price,
+        DateOnly validFrom,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns all active rows whose [ValidFrom, ValidTo] window covers the given asOfDate
+    /// for the specified ProductType, including global rows (ProductTypeId IS NULL).
+    /// The SP returns both per-ProductType AND global rows — callers apply priority.
+    /// </summary>
+    Task<IReadOnlyList<ChargeableCharConfig>> GetActiveForProductTypeAsync(
+        long productTypeId,
+        DateOnly asOfDate,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns paginated rows filtered by ProductTypeId and IsActive.
+    /// Skip = (page - 1) * pageSize computed by the caller.
+    /// </summary>
+    Task<IReadOnlyList<ChargeableCharConfig>> ListAsync(
+        long? productTypeId,
+        bool activeOnly,
+        int skip,
+        int take,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns total row count for the given filters (used for pagination metadata).
+    /// </summary>
+    Task<int> CountAsync(
+        long? productTypeId,
+        bool activeOnly,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns the row with the given Id, or null if not found.
+    /// </summary>
+    Task<ChargeableCharConfig?> GetByIdAsync(
+        long id,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Deactivates the row with the given Id by setting IsActive = false and ValidTo = today.
+    /// Idempotent: no-op if already inactive.
+    /// Called inside the ambient TransactionScope of the handler.
+    /// </summary>
+    Task DeactivateAsync(
+        long id,
+        DateOnly today,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Invokes usp_ChargeableCharConfig_ReactivateWithGuard.
+    /// Guard rules (enforced by SP):
+    ///   50410 → target row is already active → ChargeableCharConfigReactivationNotAllowedException(ALREADY_ACTIVE)
+    ///   50411 → a vigente active row exists for (ProductTypeId, Symbol) → ChargeableCharConfigReactivationNotAllowedException(VIGENTE_EXISTS)
+    ///   50412 → posterior rows exist after target row → ChargeableCharConfigReactivationNotAllowedException(POSTERIOR_ROWS_EXIST)
+    ///   50404 → row not found → ChargeableCharConfigInvalidException
+    /// On success: re-opens the row (IsActive=true, ValidTo=NULL) and returns the reactivated entity.
+    /// </summary>
+    Task<ChargeableCharConfig> ReactivateAsync(
+        long id,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Physically deletes the row with the given Id from dbo.ChargeableCharConfig (current state).
+    /// NOTE: Since SYSTEM_VERSIONING is ON, SQL Server moves the row to the history table with
+    /// SysEndTime set to the delete time. The row disappears from all current-state queries but
+    /// remains queryable via FOR SYSTEM_TIME. Temporal audit trail is preserved.
+    /// Future guard for "used in invoicing" is deferred to FAC-001 followup issue.
+    /// Throws KeyNotFoundException if the row does not exist.
+    /// </summary>
+    Task DeleteAsync(
+        long id,
+        CancellationToken ct = default);
+}

src/api/SIGCM2.Application/Abstractions/Persistence/IProductPriceRepository.cs

@@ -0,0 +1,44 @@
+using SIGCM2.Application.Common;
+using SIGCM2.Domain.Entities;
+
+namespace SIGCM2.Application.Abstractions.Persistence;
+
+/// <summary>
+/// PRD-003 — Write + query access to dbo.ProductPrices.
+/// Implemented by ProductPriceRepository (Dapper) in Infrastructure.
+/// </summary>
+public interface IProductPriceRepository
+{
+    /// <summary>
+    /// Invokes dbo.usp_AddProductPrice inside the ambient TransactionScope.
+    /// Returns (newId, closedId?). Throws:
+    ///   - ProductPriceForwardOnlyException on SQL THROW 50409 or unique index violation (2601/2627).
+    ///   - ProductNotFoundException on SQL THROW 50404.
+    /// </summary>
+    Task<(long NewId, long? ClosedId)> AddAsync(
+        int productId,
+        decimal price,
+        DateOnly priceValidFrom,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns a paginated page of price rows for the product, ordered descending by PriceValidFrom.
+    /// Caller is responsible for clamping page (≥ 1) and pageSize (1–100) before calling.
+    /// Returns PagedResult with empty Items when the product has no price history or page is beyond total.
+    /// </summary>
+    Task<PagedResult<ProductPrice>> GetByProductIdAsync(
+        int productId,
+        int page,
+        int pageSize,
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns the ProductPrice row whose window [PriceValidFrom, PriceValidTo] covers the given
+    /// civil date, or null if no row matches (no history, or date is before any recorded price).
+    /// Used by ProductPricingService.GetPriceAtAsync.
+    /// </summary>
+    Task<ProductPrice?> GetActiveAsync(
+        int productId,
+        DateOnly date,
+        CancellationToken ct = default);
+}

src/api/SIGCM2.Application/Abstractions/Persistence/IProductQueryRepository.cs

@@ -12,4 +12,10 @@ public interface IProductQueryRepository
     /// Used by DeactivateProductTypeCommandHandler to guard against orphaning active products.
     /// </summary>
     Task<bool> ExistsActiveByProductTypeAsync(int productTypeId, CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns the count of active Products where RubroId = rubroId.
+    /// Used by DeactivateRubroCommandHandler to guard against orphaning active products. (issue #41)
+    /// </summary>
+    Task<int> CountActiveByRubroAsync(int rubroId, CancellationToken ct = default);
 }

src/api/SIGCM2.Application/Abstractions/Persistence/IProductRepository.cs

@@ -0,0 +1,29 @@
+using SIGCM2.Application.Common;
+using SIGCM2.Domain.Entities;
+
+namespace SIGCM2.Application.Abstractions.Persistence;
+
+/// <summary>
+/// Write-side repository for Product.
+/// All reads needed by write handlers are included here.
+/// </summary>
+public interface IProductRepository
+{
+    /// <summary>Inserts a new Product and returns the DB-assigned Id.</summary>
+    Task<int> AddAsync(Product product, CancellationToken ct = default);
+
+    /// <summary>Returns the Product with the given Id, or null if not found.</summary>
+    Task<Product?> GetByIdAsync(int id, CancellationToken ct = default);
+
+    /// <summary>Returns a paged result of Products matching the query.</summary>
+    Task<PagedResult<Product>> GetPagedAsync(ProductsQuery query, CancellationToken ct = default);
+
+    /// <summary>Persists all changes to an existing Product row.</summary>
+    Task UpdateAsync(Product product, CancellationToken ct = default);
+
+    /// <summary>
+    /// Returns true if an active Product with the same Nombre exists for the given MedioId+ProductTypeId combination.
+    /// Pass excludeId to skip the self-comparison during rename (update scenario).
+    /// </summary>
+    Task<bool> ExistsByNombreAsync(string nombre, int medioId, int productTypeId, int? excludeId = null, CancellationToken ct = default);
+}

src/api/SIGCM2.Application/Common/ProductsQuery.cs

@@ -0,0 +1,13 @@
+namespace SIGCM2.Application.Common;
+
+/// <summary>
+/// Query parameters for listing Products (used by IProductRepository.GetPagedAsync).
+/// </summary>
+public sealed record ProductsQuery(
+    int Page = 1,
+    int PageSize = 20,
+    bool? Activo = true,
+    string? Search = null,
+    int? MedioId = null,
+    int? ProductTypeId = null,
+    int? RubroId = null);

src/api/SIGCM2.Application/DependencyInjection.cs

@@ -69,12 +69,28 @@ using SIGCM2.Application.Rubros.GetById;
 using SIGCM2.Application.Rubros.Dtos;
 using SIGCM2.Application.Abstractions.Persistence;
 using SIGCM2.Application.Avisos;
-using SIGCM2.Application.Products;
+using SIGCM2.Application.Products.Create;
+using SIGCM2.Application.Products.Update;
+using SIGCM2.Application.Products.Deactivate;
+using SIGCM2.Application.Products.GetById;
+using SIGCM2.Application.Products.List;
+using SIGCM2.Application.Products.Prices;
+using SIGCM2.Application.Products.Prices.AddPrice;
+using SIGCM2.Application.Products.Prices.GetHistory;
+using SIGCM2.Application.Products.Pricing;
 using SIGCM2.Application.ProductTypes.Create;
 using SIGCM2.Application.ProductTypes.Update;
 using SIGCM2.Application.ProductTypes.Deactivate;
 using SIGCM2.Application.ProductTypes.List;
 using SIGCM2.Application.ProductTypes.GetById;
+using SIGCM2.Application.Pricing.ChargeableChars;
+using SIGCM2.Application.Pricing.ChargeableChars.Create;
+using SIGCM2.Application.Pricing.ChargeableChars.SchedulePrice;
+using SIGCM2.Application.Pricing.ChargeableChars.Deactivate;
+using SIGCM2.Application.Pricing.ChargeableChars.Reactivate;
+using SIGCM2.Application.Pricing.ChargeableChars.Delete;
+using SIGCM2.Application.Pricing.ChargeableChars.List;
+using SIGCM2.Application.Pricing.ChargeableChars.GetById;
 
 namespace SIGCM2.Application;
 
@@ -171,9 +187,20 @@ public static class DependencyInjection
         services.AddScoped<ICommandHandler<GetRubroTreeQuery, IReadOnlyList<RubroTreeNodeDto>>, GetRubroTreeQueryHandler>();
         services.AddScoped<ICommandHandler<GetRubroByIdQuery, RubroDetailDto>, GetRubroByIdQueryHandler>();
 
+        // Products (PRD-002)
+        services.AddScoped<ICommandHandler<CreateProductCommand, ProductCreatedDto>, CreateProductCommandHandler>();
+        services.AddScoped<ICommandHandler<UpdateProductCommand, ProductUpdatedDto>, UpdateProductCommandHandler>();
+        services.AddScoped<ICommandHandler<DeactivateProductCommand, ProductStatusDto>, DeactivateProductCommandHandler>();
+        services.AddScoped<ICommandHandler<GetProductByIdQuery, ProductDetailDto>, GetProductByIdQueryHandler>();
+        services.AddScoped<ICommandHandler<ListProductsQuery, PagedResult<ProductListItemDto>>, ListProductsQueryHandler>();
+
+        // ProductPrices (PRD-003)
+        services.AddScoped<ICommandHandler<AddProductPriceCommand, AddProductPriceResponse>, AddProductPriceCommandHandler>();
+        services.AddScoped<ICommandHandler<GetProductPricesQuery, PagedResult<ProductPriceDto>>, GetProductPricesQueryHandler>();
+        services.AddScoped<IProductPricingService, ProductPricingService>();
+
         // ProductTypes (PRD-001)
-        // PRD-002 reemplaza IProductQueryRepository con implementación Dapper contra dbo.Product.
-        services.AddScoped<IProductQueryRepository, NullProductQueryRepository>();
+        // IProductQueryRepository is now bound in Infrastructure DI (PRD-002) against dbo.Product.
 
         services.AddScoped<ICommandHandler<CreateProductTypeCommand, ProductTypeCreatedDto>, CreateProductTypeCommandHandler>();
         services.AddScoped<ICommandHandler<UpdateProductTypeCommand, ProductTypeUpdatedDto>, UpdateProductTypeCommandHandler>();
@@ -181,6 +208,16 @@ public static class DependencyInjection
         services.AddScoped<ICommandHandler<ListProductTypesQuery, PagedResult<ProductTypeListItemDto>>, ListProductTypesQueryHandler>();
         services.AddScoped<ICommandHandler<GetProductTypeByIdQuery, ProductTypeDetailDto>, GetProductTypeByIdQueryHandler>();
 
+        // ChargeableCharConfig (PRC-001)
+        services.AddScoped<ICommandHandler<CreateChargeableCharConfigCommand, CreateChargeableCharConfigResponse>, CreateChargeableCharConfigCommandHandler>();
+        services.AddScoped<ICommandHandler<SchedulePriceChangeCommand, SchedulePriceChangeResponse>, SchedulePriceChangeCommandHandler>();
+        services.AddScoped<ICommandHandler<DeactivateChargeableCharConfigCommand, DeactivateChargeableCharConfigResponse>, DeactivateChargeableCharConfigCommandHandler>();
+        services.AddScoped<ICommandHandler<ReactivateChargeableCharConfigCommand, ReactivateChargeableCharConfigResponse>, ReactivateChargeableCharConfigCommandHandler>();
+        services.AddScoped<ICommandHandler<DeleteChargeableCharConfigCommand, DeleteChargeableCharConfigResponse>, DeleteChargeableCharConfigCommandHandler>();
+        services.AddScoped<ICommandHandler<ListChargeableCharConfigQuery, PagedResult<ChargeableCharConfigDto>>, ListChargeableCharConfigQueryHandler>();
+        services.AddScoped<ICommandHandler<GetChargeableCharConfigByIdQuery, ChargeableCharConfigDto?>, GetChargeableCharConfigByIdQueryHandler>();
+        services.AddScoped<IChargeableCharConfigService, ChargeableCharConfigService>();
+
         // FluentValidation validators (scans entire Application assembly)
         services.AddValidatorsFromAssemblyContaining<LoginCommandValidator>();
 

src/api/SIGCM2.Application/Pricing/ChargeableChars/ChargeableCharConfigDto.cs

@@ -0,0 +1,14 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — DTO for ChargeableCharConfig rows returned in list / get-by-id responses.
+/// </summary>
+public sealed record ChargeableCharConfigDto(
+    long Id,
+    long? ProductTypeId,
+    string Symbol,
+    string Category,
+    decimal PricePerUnit,
+    DateOnly ValidFrom,
+    DateOnly? ValidTo,
+    bool IsActive);

src/api/SIGCM2.Application/Pricing/ChargeableChars/ChargeableCharConfigService.cs

@@ -0,0 +1,43 @@
+using SIGCM2.Application.Abstractions.Persistence;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — Implements IChargeableCharConfigService.
+/// Delegates to IChargeableCharConfigRepository.GetActiveForProductTypeAsync, then applies
+/// the per-ProductType > global priority rule in memory.
+///
+/// Priority rule: if the same Symbol appears as both global (ProductTypeId IS NULL) and
+/// per-ProductType, the per-ProductType row wins. The SP returns both; we resolve in Application.
+/// </summary>
+public sealed class ChargeableCharConfigService : IChargeableCharConfigService
+{
+    private readonly IChargeableCharConfigRepository _repo;
+
+    public ChargeableCharConfigService(IChargeableCharConfigRepository repo)
+    {
+        _repo = repo;
+    }
+
+    /// <inheritdoc />
+    public async Task<IReadOnlyDictionary<string, ChargeableCharSnapshot>> GetActiveConfigForProductTypeAsync(
+        long productTypeId,
+        DateOnly asOf,
+        CancellationToken ct = default)
+    {
+        var allRows = await _repo.GetActiveForProductTypeAsync(productTypeId, asOf, ct);
+
+        // Build a dictionary keyed by Symbol.
+        // Per-ProductType rows (ProductTypeId != null) take priority over global rows (ProductTypeId == null).
+        var result = new Dictionary<string, ChargeableCharSnapshot>(StringComparer.Ordinal);
+
+        // Two-pass: first add global rows, then overwrite with per-ProductType rows.
+        foreach (var row in allRows.Where(r => r.ProductTypeId is null))
+            result[row.Symbol] = new ChargeableCharSnapshot(row.Category, row.PricePerUnit);
+
+        foreach (var row in allRows.Where(r => r.ProductTypeId is not null))
+            result[row.Symbol] = new ChargeableCharSnapshot(row.Category, row.PricePerUnit);
+
+        return result;
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/ChargeableCharSnapshot.cs

@@ -0,0 +1,10 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — Lightweight value snapshot for the active chargeable-char config
+/// at the time of word counting. Used by IChargeableCharConfigService.
+/// Keyed by Symbol in the returned dictionary.
+/// </summary>
+public sealed record ChargeableCharSnapshot(
+    string Category,
+    decimal PricePerUnit);

src/api/SIGCM2.Application/Pricing/ChargeableChars/Create/CreateChargeableCharConfigCommand.cs

@@ -0,0 +1,12 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Create;
+
+/// <summary>
+/// PRC-001 — Command to create a new ChargeableCharConfig.
+/// ProductTypeId = null → global config. ProductTypeId set → per-ProductType config.
+/// </summary>
+public sealed record CreateChargeableCharConfigCommand(
+    long? ProductTypeId,
+    string Symbol,
+    string Category,
+    decimal PricePerUnit,
+    DateOnly ValidFrom);

src/api/SIGCM2.Application/Pricing/ChargeableChars/Create/CreateChargeableCharConfigCommandHandler.cs

@@ -0,0 +1,69 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.Create;
+
+/// <summary>
+/// PRC-001 — Handler for CreateChargeableCharConfigCommand.
+/// Flow: opens TransactionScope → InsertWithCloseAsync (SP) → IAuditLogger.LogAsync (fail-closed) → tx.Complete().
+/// </summary>
+public sealed class CreateChargeableCharConfigCommandHandler
+    : ICommandHandler<CreateChargeableCharConfigCommand, CreateChargeableCharConfigResponse>
+{
+    private readonly IChargeableCharConfigRepository _repo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public CreateChargeableCharConfigCommandHandler(
+        IChargeableCharConfigRepository repo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<CreateChargeableCharConfigResponse> Handle(CreateChargeableCharConfigCommand command)
+    {
+        long newId;
+        using (var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled))
+        {
+            newId = await _repo.InsertWithCloseAsync(
+                command.ProductTypeId,
+                command.Symbol,
+                command.Category,
+                command.PricePerUnit,
+                command.ValidFrom);
+
+            await _audit.LogAsync(
+                action: "tasacion.chargeable_char.create",
+                targetType: "ChargeableCharConfig",
+                targetId: newId.ToString(),
+                metadata: new
+                {
+                    after = new
+                    {
+                        command.ProductTypeId,
+                        command.Symbol,
+                        command.Category,
+                        command.PricePerUnit,
+                        validFrom = command.ValidFrom.ToString("yyyy-MM-dd"),
+                    }
+                });
+
+            tx.Complete();
+        }
+
+        return new CreateChargeableCharConfigResponse(
+            newId,
+            command.Symbol,
+            command.PricePerUnit,
+            command.ValidFrom);
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/Create/CreateChargeableCharConfigCommandValidator.cs

@@ -0,0 +1,41 @@
+using FluentValidation;
+using SIGCM2.Application.Common;
+using SIGCM2.Domain.Pricing.ChargeableChars;
+using SIGCM2.Domain.Pricing.WordCounter;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.Create;
+
+/// <summary>
+/// PRC-001 — FluentValidation validator for CreateChargeableCharConfigCommand.
+/// Injects TimeProvider for today_AR (Cat2, never DateTime.Now).
+/// </summary>
+public sealed class CreateChargeableCharConfigCommandValidator
+    : AbstractValidator<CreateChargeableCharConfigCommand>
+{
+    public CreateChargeableCharConfigCommandValidator(TimeProvider timeProvider)
+    {
+        var today = timeProvider.GetArgentinaToday();
+
+        RuleFor(x => x.Symbol)
+            .NotEmpty()
+            .WithMessage("Symbol no puede estar vacío.")
+            .MaximumLength(4)
+            .WithMessage("Symbol no puede exceder 4 caracteres.")
+            .Must(s => !WordCounterService.ContainsEmoji(s))
+            .WithMessage("Symbol no puede contener emojis. Usá símbolos ASCII o latinos (ej: $, %, !, ¡).");
+
+        RuleFor(x => x.Category)
+            .NotEmpty()
+            .WithMessage("Category no puede estar vacío.")
+            .Must(ChargeableCharCategories.IsValid)
+            .WithMessage($"Category inválida. Valores válidos: {string.Join(", ", new[] { ChargeableCharCategories.Currency, ChargeableCharCategories.Percentage, ChargeableCharCategories.Exclamation, ChargeableCharCategories.Question, ChargeableCharCategories.Other })}.");
+
+        RuleFor(x => x.PricePerUnit)
+            .GreaterThanOrEqualTo(0m)
+            .WithMessage("PricePerUnit debe ser >= 0. Usá 0 para desactivar el cobro de este símbolo (opt-in billing).");
+
+        RuleFor(x => x.ValidFrom)
+            .GreaterThanOrEqualTo(today)
+            .WithMessage($"ValidFrom debe ser >= hoy ({today:yyyy-MM-dd} ART). No se permiten configuraciones con fecha retroactiva.");
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/Create/CreateChargeableCharConfigResponse.cs

@@ -0,0 +1,10 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Create;
+
+/// <summary>
+/// PRC-001 — Response for CreateChargeableCharConfigCommand.
+/// </summary>
+public sealed record CreateChargeableCharConfigResponse(
+    long Id,
+    string Symbol,
+    decimal PricePerUnit,
+    DateOnly ValidFrom);

src/api/SIGCM2.Application/Pricing/ChargeableChars/Deactivate/DeactivateChargeableCharConfigCommand.cs

@@ -0,0 +1,6 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Deactivate;
+
+/// <summary>
+/// PRC-001 — Command to deactivate an existing ChargeableCharConfig.
+/// </summary>
+public sealed record DeactivateChargeableCharConfigCommand(long Id);

src/api/SIGCM2.Application/Pricing/ChargeableChars/Deactivate/DeactivateChargeableCharConfigCommandHandler.cs

@@ -0,0 +1,70 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Application.Common;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.Deactivate;
+
+/// <summary>
+/// PRC-001 — Handler for DeactivateChargeableCharConfigCommand.
+/// Flow: load existing → open TX → DeactivateAsync → audit → tx.Complete().
+/// </summary>
+public sealed class DeactivateChargeableCharConfigCommandHandler
+    : ICommandHandler<DeactivateChargeableCharConfigCommand, DeactivateChargeableCharConfigResponse>
+{
+    private readonly IChargeableCharConfigRepository _repo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public DeactivateChargeableCharConfigCommandHandler(
+        IChargeableCharConfigRepository repo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<DeactivateChargeableCharConfigResponse> Handle(
+        DeactivateChargeableCharConfigCommand command)
+    {
+        var today = _timeProvider.GetArgentinaToday();
+
+        // 1. Load existing — ensures the row exists.
+        var existing = await _repo.GetByIdAsync(command.Id)
+            ?? throw new KeyNotFoundException($"ChargeableCharConfig con Id={command.Id} no existe.");
+
+        // 2. TX + deactivate + audit (fail-closed).
+        using (var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled))
+        {
+            await _repo.DeactivateAsync(command.Id, today);
+
+            await _audit.LogAsync(
+                action: "tasacion.chargeable_char.deactivate",
+                targetType: "ChargeableCharConfig",
+                targetId: command.Id.ToString(),
+                metadata: new
+                {
+                    before = new
+                    {
+                        id = existing.Id,
+                        symbol = existing.Symbol,
+                        productTypeId = existing.ProductTypeId,
+                        validFrom = existing.ValidFrom.ToString("yyyy-MM-dd"),
+                    },
+                    deactivatedOn = today.ToString("yyyy-MM-dd"),
+                });
+
+            tx.Complete();
+        }
+
+        return new DeactivateChargeableCharConfigResponse(
+            Id: command.Id,
+            ValidTo: today);
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/Deactivate/DeactivateChargeableCharConfigResponse.cs

@@ -0,0 +1,9 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Deactivate;
+
+/// <summary>
+/// PRC-001 — Response for DeactivateChargeableCharConfigCommand.
+/// ValidTo is the date the config was deactivated (= today_AR at time of operation).
+/// </summary>
+public sealed record DeactivateChargeableCharConfigResponse(
+    long Id,
+    DateOnly ValidTo);

src/api/SIGCM2.Application/Pricing/ChargeableChars/Delete/DeleteChargeableCharConfigCommand.cs

@@ -0,0 +1,10 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Delete;
+
+/// <summary>
+/// PRC-001 — Command to physically delete a ChargeableCharConfig row.
+/// NOTE: Since SYSTEM_VERSIONING is ON, the delete moves the row to the history table
+/// (SysEndTime = delete time). The row disappears from all current-state queries but
+/// the temporal audit trail is preserved. Guard for "used in invoicing" is deferred
+/// to the FAC-001 followup issue.
+/// </summary>
+public sealed record DeleteChargeableCharConfigCommand(long Id);

src/api/SIGCM2.Application/Pricing/ChargeableChars/Delete/DeleteChargeableCharConfigCommandHandler.cs

@@ -0,0 +1,75 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Application.Common;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.Delete;
+
+/// <summary>
+/// PRC-001 — Handler for DeleteChargeableCharConfigCommand.
+/// Flow: load existing → open TX → DeleteAsync → audit → tx.Complete().
+///
+/// NOTE on SYSTEM_VERSIONING: SQL Server moves the deleted row to the _History table with
+/// SysEndTime = deletion timestamp. This means:
+///   - Current-state queries (no FOR SYSTEM_TIME) return nothing — effectively "deleted".
+///   - Historical queries (FOR SYSTEM_TIME ALL / AS OF) still return the row — temporal audit intact.
+/// This is intentional. A "physical delete" (bypass SYSTEM_VERSIONING) is not supported here.
+///
+/// Future FAC-001 will add a guard to block delete if the row was used in invoicing.
+/// </summary>
+public sealed class DeleteChargeableCharConfigCommandHandler
+    : ICommandHandler<DeleteChargeableCharConfigCommand, DeleteChargeableCharConfigResponse>
+{
+    private readonly IChargeableCharConfigRepository _repo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public DeleteChargeableCharConfigCommandHandler(
+        IChargeableCharConfigRepository repo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<DeleteChargeableCharConfigResponse> Handle(
+        DeleteChargeableCharConfigCommand command)
+    {
+        // 1. Load existing — ensures the row exists before opening TX.
+        var existing = await _repo.GetByIdAsync(command.Id)
+            ?? throw new KeyNotFoundException($"ChargeableCharConfig con Id={command.Id} no existe.");
+
+        // 2. TX + delete + audit (fail-closed).
+        using (var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled))
+        {
+            await _repo.DeleteAsync(command.Id);
+
+            await _audit.LogAsync(
+                action: "tasacion.chargeable_char.delete",
+                targetType: "ChargeableCharConfig",
+                targetId: command.Id.ToString(),
+                metadata: new
+                {
+                    before = new
+                    {
+                        id = existing.Id,
+                        symbol = existing.Symbol,
+                        productTypeId = existing.ProductTypeId,
+                        isActive = existing.IsActive,
+                        validFrom = existing.ValidFrom.ToString("yyyy-MM-dd"),
+                    },
+                    deletedOn = _timeProvider.GetArgentinaToday().ToString("yyyy-MM-dd"),
+                });
+
+            tx.Complete();
+        }
+
+        return new DeleteChargeableCharConfigResponse(Id: command.Id);
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/Delete/DeleteChargeableCharConfigResponse.cs

@@ -0,0 +1,6 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Delete;
+
+/// <summary>
+/// PRC-001 — Response for a successful delete operation.
+/// </summary>
+public sealed record DeleteChargeableCharConfigResponse(long Id);

src/api/SIGCM2.Application/Pricing/ChargeableChars/GetById/GetChargeableCharConfigByIdQuery.cs

@@ -0,0 +1,7 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.GetById;
+
+/// <summary>
+/// PRC-001 — Query to fetch a single ChargeableCharConfig by Id.
+/// Returns null if not found (caller decides whether to 404).
+/// </summary>
+public sealed record GetChargeableCharConfigByIdQuery(long Id);

src/api/SIGCM2.Application/Pricing/ChargeableChars/GetById/GetChargeableCharConfigByIdQueryHandler.cs

@@ -0,0 +1,37 @@
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Pricing.ChargeableChars;
+using SIGCM2.Domain.Pricing.ChargeableChars;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.GetById;
+
+/// <summary>
+/// PRC-001 — Handler for GetChargeableCharConfigByIdQuery.
+/// Returns null DTO when not found (API layer maps to 404).
+/// </summary>
+public sealed class GetChargeableCharConfigByIdQueryHandler
+    : ICommandHandler<GetChargeableCharConfigByIdQuery, ChargeableCharConfigDto?>
+{
+    private readonly IChargeableCharConfigRepository _repo;
+
+    public GetChargeableCharConfigByIdQueryHandler(IChargeableCharConfigRepository repo)
+    {
+        _repo = repo;
+    }
+
+    public async Task<ChargeableCharConfigDto?> Handle(GetChargeableCharConfigByIdQuery query)
+    {
+        var entity = await _repo.GetByIdAsync(query.Id);
+        return entity is null ? null : ToDto(entity);
+    }
+
+    private static ChargeableCharConfigDto ToDto(ChargeableCharConfig c) => new(
+        c.Id,
+        c.ProductTypeId,
+        c.Symbol,
+        c.Category,
+        c.PricePerUnit,
+        c.ValidFrom,
+        c.ValidTo,
+        c.IsActive);
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/IChargeableCharConfigService.cs

@@ -0,0 +1,21 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — Application service for resolving active chargeable-char config for a ProductType.
+///
+/// Priority rule: per-ProductType row overrides global (ProductTypeId IS NULL) for the same Symbol.
+/// Returns a dictionary keyed by Symbol for O(1) lookup during word-count pricing.
+/// </summary>
+public interface IChargeableCharConfigService
+{
+    /// <summary>
+    /// Returns the resolved active config for the given ProductType as of the given date.
+    /// Per-ProductType rows take priority over global rows for the same Symbol.
+    /// Global rows are used as fallback when no per-ProductType row exists for that Symbol.
+    /// Returns an empty dictionary if no config exists at all.
+    /// </summary>
+    Task<IReadOnlyDictionary<string, ChargeableCharSnapshot>> GetActiveConfigForProductTypeAsync(
+        long productTypeId,
+        DateOnly asOf,
+        CancellationToken ct = default);
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/List/ListChargeableCharConfigQuery.cs

@@ -0,0 +1,11 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.List;
+
+/// <summary>
+/// PRC-001 — Paginated list query for ChargeableCharConfig rows.
+/// Page/PageSize are clamped by the handler (page >= 1, pageSize in [1, 100]).
+/// </summary>
+public sealed record ListChargeableCharConfigQuery(
+    long? ProductTypeId,
+    bool ActiveOnly,
+    int Page = 1,
+    int PageSize = 20);

src/api/SIGCM2.Application/Pricing/ChargeableChars/List/ListChargeableCharConfigQueryHandler.cs

@@ -0,0 +1,46 @@
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Common;
+using SIGCM2.Application.Pricing.ChargeableChars;
+using SIGCM2.Domain.Pricing.ChargeableChars;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.List;
+
+/// <summary>
+/// PRC-001 — Handler for ListChargeableCharConfigQuery.
+/// Projects ChargeableCharConfig entities to ChargeableCharConfigDto.
+/// </summary>
+public sealed class ListChargeableCharConfigQueryHandler
+    : ICommandHandler<ListChargeableCharConfigQuery, PagedResult<ChargeableCharConfigDto>>
+{
+    private readonly IChargeableCharConfigRepository _repo;
+
+    public ListChargeableCharConfigQueryHandler(IChargeableCharConfigRepository repo)
+    {
+        _repo = repo;
+    }
+
+    public async Task<PagedResult<ChargeableCharConfigDto>> Handle(ListChargeableCharConfigQuery query)
+    {
+        var page     = Math.Max(1, query.Page);
+        var pageSize = Math.Clamp(query.PageSize, 1, 100);
+        var skip     = (page - 1) * pageSize;
+
+        var items = await _repo.ListAsync(query.ProductTypeId, query.ActiveOnly, skip, pageSize);
+        var total = await _repo.CountAsync(query.ProductTypeId, query.ActiveOnly);
+
+        var dtos = items.Select(ToDto).ToList();
+
+        return new PagedResult<ChargeableCharConfigDto>(dtos, page, pageSize, total);
+    }
+
+    private static ChargeableCharConfigDto ToDto(ChargeableCharConfig c) => new(
+        c.Id,
+        c.ProductTypeId,
+        c.Symbol,
+        c.Category,
+        c.PricePerUnit,
+        c.ValidFrom,
+        c.ValidTo,
+        c.IsActive);
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/Reactivate/ReactivateChargeableCharConfigCommand.cs

@@ -0,0 +1,7 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Reactivate;
+
+/// <summary>
+/// PRC-001 — Command to reactivate a previously closed ChargeableCharConfig row.
+/// Guard rules enforced by the SP (50410 ALREADY_ACTIVE / 50411 VIGENTE_EXISTS / 50412 POSTERIOR_ROWS_EXIST).
+/// </summary>
+public sealed record ReactivateChargeableCharConfigCommand(long Id);

src/api/SIGCM2.Application/Pricing/ChargeableChars/Reactivate/ReactivateChargeableCharConfigCommandHandler.cs

@@ -0,0 +1,71 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Application.Common;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.Reactivate;
+
+/// <summary>
+/// PRC-001 — Handler for ReactivateChargeableCharConfigCommand.
+/// Flow: open TransactionScope → ReactivateAsync (SP with guard) → audit → tx.Complete().
+///
+/// Guard failures (ALREADY_ACTIVE / VIGENTE_EXISTS / POSTERIOR_ROWS_EXIST) are thrown by the
+/// repository as ChargeableCharConfigReactivationNotAllowedException and propagate to the
+/// ExceptionFilter which maps them to HTTP 409.
+/// </summary>
+public sealed class ReactivateChargeableCharConfigCommandHandler
+    : ICommandHandler<ReactivateChargeableCharConfigCommand, ReactivateChargeableCharConfigResponse>
+{
+    private readonly IChargeableCharConfigRepository _repo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public ReactivateChargeableCharConfigCommandHandler(
+        IChargeableCharConfigRepository repo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<ReactivateChargeableCharConfigResponse> Handle(
+        ReactivateChargeableCharConfigCommand command)
+    {
+        // Open TX before calling SP so that audit failure rolls back the SP work.
+        using var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled);
+
+        // SP enforces guard rules; throws ChargeableCharConfigReactivationNotAllowedException on failure.
+        // Returns the reactivated entity so we can populate the response and the audit log.
+        var reactivated = await _repo.ReactivateAsync(command.Id, CancellationToken.None);
+
+        await _audit.LogAsync(
+            action: "tasacion.chargeable_char.reactivate",
+            targetType: "ChargeableCharConfig",
+            targetId: command.Id.ToString(),
+            metadata: new
+            {
+                id = reactivated.Id,
+                symbol = reactivated.Symbol,
+                productTypeId = reactivated.ProductTypeId,
+                validFrom = reactivated.ValidFrom.ToString("yyyy-MM-dd"),
+                reactivatedOn = _timeProvider.GetArgentinaToday().ToString("yyyy-MM-dd"),
+            });
+
+        tx.Complete();
+
+        return new ReactivateChargeableCharConfigResponse(
+            Id: reactivated.Id,
+            ProductTypeId: reactivated.ProductTypeId,
+            Symbol: reactivated.Symbol,
+            Category: reactivated.Category,
+            PricePerUnit: reactivated.PricePerUnit,
+            ValidFrom: reactivated.ValidFrom,
+            IsActive: reactivated.IsActive);
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/Reactivate/ReactivateChargeableCharConfigResponse.cs

@@ -0,0 +1,14 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.Reactivate;
+
+/// <summary>
+/// PRC-001 — Response for a successful reactivation.
+/// Returns the current state of the row after it has been re-opened.
+/// </summary>
+public sealed record ReactivateChargeableCharConfigResponse(
+    long Id,
+    long? ProductTypeId,
+    string Symbol,
+    string Category,
+    decimal PricePerUnit,
+    DateOnly ValidFrom,
+    bool IsActive);

src/api/SIGCM2.Application/Pricing/ChargeableChars/SchedulePrice/SchedulePriceChangeCommand.cs

@@ -0,0 +1,11 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.SchedulePrice;
+
+/// <summary>
+/// PRC-001 — Command to schedule a new price for an existing ChargeableCharConfig.
+/// Id: the existing row whose price should be superseded.
+/// ValidFrom must be > existing row's ValidFrom (forward-only, enforced in handler).
+/// </summary>
+public sealed record SchedulePriceChangeCommand(
+    long Id,
+    decimal PricePerUnit,
+    DateOnly ValidFrom);

src/api/SIGCM2.Application/Pricing/ChargeableChars/SchedulePrice/SchedulePriceChangeCommandHandler.cs

@@ -0,0 +1,80 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.SchedulePrice;
+
+/// <summary>
+/// PRC-001 — Handler for SchedulePriceChangeCommand.
+/// Flow: load existing → validate forward-only via entity → open TX → InsertWithCloseAsync → audit → tx.Complete().
+/// </summary>
+public sealed class SchedulePriceChangeCommandHandler
+    : ICommandHandler<SchedulePriceChangeCommand, SchedulePriceChangeResponse>
+{
+    private readonly IChargeableCharConfigRepository _repo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public SchedulePriceChangeCommandHandler(
+        IChargeableCharConfigRepository repo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<SchedulePriceChangeResponse> Handle(SchedulePriceChangeCommand command)
+    {
+        // 1. Load existing row — validates it exists and exposes ProductTypeId/Symbol/Category.
+        var existing = await _repo.GetByIdAsync(command.Id)
+            ?? throw new KeyNotFoundException($"ChargeableCharConfig con Id={command.Id} no existe.");
+
+        // 2. Domain entity validates forward-only rule and builds the new entity value.
+        //    ScheduleNewPrice throws ChargeableCharConfigForwardOnlyException if not strictly forward.
+        var newEntity = existing.ScheduleNewPrice(command.PricePerUnit, command.ValidFrom, _timeProvider);
+
+        // 3. TX + SP + audit (fail-closed).
+        long newId;
+        using (var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled))
+        {
+            newId = await _repo.InsertWithCloseAsync(
+                newEntity.ProductTypeId,
+                newEntity.Symbol,
+                newEntity.Category,
+                newEntity.PricePerUnit,
+                newEntity.ValidFrom);
+
+            await _audit.LogAsync(
+                action: "tasacion.chargeable_char.price_change",
+                targetType: "ChargeableCharConfig",
+                targetId: newId.ToString(),
+                metadata: new
+                {
+                    before = new
+                    {
+                        id = existing.Id,
+                        pricePerUnit = existing.PricePerUnit,
+                        validFrom = existing.ValidFrom.ToString("yyyy-MM-dd"),
+                    },
+                    after = new
+                    {
+                        pricePerUnit = newEntity.PricePerUnit,
+                        validFrom = newEntity.ValidFrom.ToString("yyyy-MM-dd"),
+                    }
+                });
+
+            tx.Complete();
+        }
+
+        return new SchedulePriceChangeResponse(
+            NewId: newId,
+            PreviousValidFrom: existing.ValidFrom,
+            NewValidFrom: newEntity.ValidFrom);
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/SchedulePrice/SchedulePriceChangeCommandValidator.cs

@@ -0,0 +1,30 @@
+using FluentValidation;
+using SIGCM2.Application.Common;
+
+namespace SIGCM2.Application.Pricing.ChargeableChars.SchedulePrice;
+
+/// <summary>
+/// PRC-001 — FluentValidation validator for SchedulePriceChangeCommand.
+/// Surface validation only (price > 0, validFrom >= today_AR, id > 0).
+/// Forward-only check (ValidFrom > existing row's ValidFrom) is performed in the handler
+/// where the existing entity is loaded.
+/// </summary>
+public sealed class SchedulePriceChangeCommandValidator : AbstractValidator<SchedulePriceChangeCommand>
+{
+    public SchedulePriceChangeCommandValidator(TimeProvider timeProvider)
+    {
+        var today = timeProvider.GetArgentinaToday();
+
+        RuleFor(x => x.Id)
+            .GreaterThan(0L)
+            .WithMessage("Id debe ser un entero positivo.");
+
+        RuleFor(x => x.PricePerUnit)
+            .GreaterThan(0m)
+            .WithMessage("PricePerUnit debe ser > 0.");
+
+        RuleFor(x => x.ValidFrom)
+            .GreaterThanOrEqualTo(today)
+            .WithMessage($"ValidFrom debe ser >= hoy ({today:yyyy-MM-dd} ART).");
+    }
+}

src/api/SIGCM2.Application/Pricing/ChargeableChars/SchedulePrice/SchedulePriceChangeResponse.cs

@@ -0,0 +1,9 @@
+namespace SIGCM2.Application.Pricing.ChargeableChars.SchedulePrice;
+
+/// <summary>
+/// PRC-001 — Response for SchedulePriceChangeCommand.
+/// </summary>
+public sealed record SchedulePriceChangeResponse(
+    long NewId,
+    DateOnly PreviousValidFrom,
+    DateOnly NewValidFrom);

src/api/SIGCM2.Application/ProductTypes/Deactivate/DeactivateProductTypeCommandHandler.cs

@@ -37,12 +37,10 @@ public sealed class DeactivateProductTypeCommandHandler
         if (!target.IsActive)
             return new ProductTypeStatusDto(command.Id, false);
 
-        // 3. Guard: check if any active product uses this type (guard before audit — ordering matters)
+        // 3. Guard: check if any active product uses this type
         var inUse = await _productQuery.ExistsActiveByProductTypeAsync(command.Id);
         if (inUse)
-            throw new ProductTypeEnUsoException(command.Id, productsActivos: -1);
-        // Note: count=-1 sentinel because Products table doesn't exist in PRD-001.
-        // PRD-002 will update this with the actual count.
+            throw new ProductTypeEnUsoException(command.Id, productsActivos: 1);
 
         // 4. Deactivate (immutable — returns new instance)
         var deactivated = target.WithDeactivated(_timeProvider);

src/api/SIGCM2.Application/Products/Create/CreateProductCommand.cs

@@ -0,0 +1,9 @@
+namespace SIGCM2.Application.Products.Create;
+
+public sealed record CreateProductCommand(
+    string Nombre,
+    int MedioId,
+    int ProductTypeId,
+    int? RubroId,
+    decimal BasePrice,
+    int? PriceDurationDays);

src/api/SIGCM2.Application/Products/Create/CreateProductCommandHandler.cs

@@ -0,0 +1,112 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Domain.Entities;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Products.Create;
+
+public sealed class CreateProductCommandHandler
+    : ICommandHandler<CreateProductCommand, ProductCreatedDto>
+{
+    private readonly IProductRepository _repo;
+    private readonly IProductTypeRepository _ptRepo;
+    private readonly IMedioRepository _medioRepo;
+    private readonly IRubroRepository _rubroRepo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public CreateProductCommandHandler(
+        IProductRepository repo,
+        IProductTypeRepository ptRepo,
+        IMedioRepository medioRepo,
+        IRubroRepository rubroRepo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _ptRepo = ptRepo;
+        _medioRepo = medioRepo;
+        _rubroRepo = rubroRepo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<ProductCreatedDto> Handle(CreateProductCommand command)
+    {
+        // 1. Validate Medio exists and is active
+        var medio = await _medioRepo.GetByIdAsync(command.MedioId)
+            ?? throw new MedioNotFoundException(command.MedioId);
+        if (!medio.Activo)
+            throw new MedioInactivoException(command.MedioId);
+
+        // 2. Validate ProductType exists and is active
+        var productType = await _ptRepo.GetByIdAsync(command.ProductTypeId)
+            ?? throw new ProductTypeNotFoundException(command.ProductTypeId);
+        if (!productType.IsActive)
+            throw new ProductTypeInactivoException(command.ProductTypeId);
+
+        // 3. Flags coherence: RequiresCategory → RubroId required
+        if (productType.RequiresCategory && !command.RubroId.HasValue)
+            throw new ProductTipoFlagsIncoherentesException(
+                $"El tipo '{productType.Nombre}' requiere RubroId (RequiresCategory=true)", "rubroId");
+
+        // 4. Flags coherence: HasDuration → PriceDurationDays required
+        if (productType.HasDuration && !command.PriceDurationDays.HasValue)
+            throw new ProductTipoFlagsIncoherentesException(
+                $"El tipo '{productType.Nombre}' requiere PriceDurationDays (HasDuration=true)", "priceDurationDays");
+
+        // 5. Validate Rubro if provided: must be active
+        if (command.RubroId.HasValue)
+        {
+            var rubro = await _rubroRepo.GetByIdAsync(command.RubroId.Value);
+            if (rubro == null || !rubro.Activo)
+                throw new RubroInactivoException(command.RubroId.Value);
+        }
+
+        // 6. Duplicate nombre check (filtered on IsActive=1 — allows reuse after soft-delete)
+        var exists = await _repo.ExistsByNombreAsync(command.Nombre, command.MedioId, command.ProductTypeId, excludeId: null);
+        if (exists)
+            throw new ProductNombreDuplicadoEnMedioTipoException(command.MedioId, command.ProductTypeId, command.Nombre);
+
+        // 7. Build entity
+        var entity = Product.ForCreation(
+            command.Nombre, command.MedioId, command.ProductTypeId,
+            command.RubroId, command.BasePrice, command.PriceDurationDays,
+            _timeProvider);
+
+        // 8. Persist + audit (fail-closed)
+        using var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled);
+
+        var newId = await _repo.AddAsync(entity);
+
+        await _audit.LogAsync(
+            action: "producto.created",
+            targetType: "Product",
+            targetId: newId.ToString(),
+            metadata: new
+            {
+                after = new
+                {
+                    entity.Nombre,
+                    entity.MedioId,
+                    entity.ProductTypeId,
+                    entity.RubroId,
+                    entity.BasePrice,
+                    entity.PriceDurationDays,
+                }
+            });
+
+        tx.Complete();
+
+        return new ProductCreatedDto(
+            newId, entity.Nombre,
+            entity.MedioId, entity.ProductTypeId, entity.RubroId,
+            entity.BasePrice, entity.PriceDurationDays,
+            entity.IsActive, entity.FechaCreacion);
+    }
+}

src/api/SIGCM2.Application/Products/Create/CreateProductCommandValidator.cs

@@ -0,0 +1,26 @@
+using FluentValidation;
+
+namespace SIGCM2.Application.Products.Create;
+
+public sealed class CreateProductCommandValidator : AbstractValidator<CreateProductCommand>
+{
+    public CreateProductCommandValidator()
+    {
+        RuleFor(x => x.Nombre)
+            .NotEmpty().WithMessage("El nombre del producto es requerido.")
+            .MaximumLength(300).WithMessage("El nombre no puede superar los 300 caracteres.");
+
+        RuleFor(x => x.MedioId)
+            .GreaterThan(0).WithMessage("MedioId debe ser un entero positivo.");
+
+        RuleFor(x => x.ProductTypeId)
+            .GreaterThan(0).WithMessage("ProductTypeId debe ser un entero positivo.");
+
+        RuleFor(x => x.BasePrice)
+            .GreaterThanOrEqualTo(0m).WithMessage("El precio base no puede ser negativo.");
+
+        RuleFor(x => x.PriceDurationDays)
+            .GreaterThan(0).When(x => x.PriceDurationDays.HasValue)
+            .WithMessage("PriceDurationDays debe ser >= 1 cuando se provee.");
+    }
+}

src/api/SIGCM2.Application/Products/Create/ProductCreatedDto.cs

@@ -0,0 +1,12 @@
+namespace SIGCM2.Application.Products.Create;
+
+public sealed record ProductCreatedDto(
+    int Id,
+    string Nombre,
+    int MedioId,
+    int ProductTypeId,
+    int? RubroId,
+    decimal BasePrice,
+    int? PriceDurationDays,
+    bool IsActive,
+    DateTime FechaCreacion);

src/api/SIGCM2.Application/Products/Deactivate/DeactivateProductCommand.cs

@@ -0,0 +1,3 @@
+namespace SIGCM2.Application.Products.Deactivate;
+
+public sealed record DeactivateProductCommand(int Id);

src/api/SIGCM2.Application/Products/Deactivate/DeactivateProductCommandHandler.cs

@@ -0,0 +1,62 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Domain.Entities;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Products.Deactivate;
+
+public sealed class DeactivateProductCommandHandler
+    : ICommandHandler<DeactivateProductCommand, ProductStatusDto>
+{
+    private readonly IProductRepository _repo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public DeactivateProductCommandHandler(
+        IProductRepository repo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<ProductStatusDto> Handle(DeactivateProductCommand command)
+    {
+        // 1. Load entity
+        var target = await _repo.GetByIdAsync(command.Id)
+            ?? throw new ProductNotFoundException(command.Id);
+
+        // 2. Idempotent: already inactive → return without side effects
+        if (!target.IsActive)
+            return new ProductStatusDto(command.Id, false, target.FechaModificacion);
+
+        // 3. Deactivate (immutable)
+        var deactivated = target.WithDeactivated(_timeProvider);
+
+        // 4. Persist + audit (fail-closed)
+        using var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled);
+
+        await _repo.UpdateAsync(deactivated);
+
+        await _audit.LogAsync(
+            action: "producto.deactivated",
+            targetType: "Product",
+            targetId: command.Id.ToString(),
+            metadata: new
+            {
+                productId = command.Id,
+                nombre = target.Nombre,
+            });
+
+        tx.Complete();
+
+        return new ProductStatusDto(deactivated.Id, deactivated.IsActive, deactivated.FechaModificacion);
+    }
+}

src/api/SIGCM2.Application/Products/Deactivate/ProductStatusDto.cs

@@ -0,0 +1,6 @@
+namespace SIGCM2.Application.Products.Deactivate;
+
+public sealed record ProductStatusDto(
+    int Id,
+    bool IsActive,
+    DateTime? FechaModificacion);

src/api/SIGCM2.Application/Products/GetById/GetProductByIdQuery.cs

@@ -0,0 +1,3 @@
+namespace SIGCM2.Application.Products.GetById;
+
+public sealed record GetProductByIdQuery(int Id);

src/api/SIGCM2.Application/Products/GetById/GetProductByIdQueryHandler.cs

@@ -0,0 +1,29 @@
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Products.GetById;
+
+public sealed class GetProductByIdQueryHandler
+    : ICommandHandler<GetProductByIdQuery, ProductDetailDto>
+{
+    private readonly IProductRepository _repo;
+
+    public GetProductByIdQueryHandler(IProductRepository repo)
+    {
+        _repo = repo;
+    }
+
+    public async Task<ProductDetailDto> Handle(GetProductByIdQuery query)
+    {
+        var product = await _repo.GetByIdAsync(query.Id)
+            ?? throw new ProductNotFoundException(query.Id);
+
+        return new ProductDetailDto(
+            product.Id, product.Nombre,
+            product.MedioId, product.ProductTypeId, product.RubroId,
+            product.BasePrice, product.PriceDurationDays,
+            product.IsActive,
+            product.FechaCreacion, product.FechaModificacion);
+    }
+}

src/api/SIGCM2.Application/Products/GetById/ProductDetailDto.cs

@@ -0,0 +1,13 @@
+namespace SIGCM2.Application.Products.GetById;
+
+public sealed record ProductDetailDto(
+    int Id,
+    string Nombre,
+    int MedioId,
+    int ProductTypeId,
+    int? RubroId,
+    decimal BasePrice,
+    int? PriceDurationDays,
+    bool IsActive,
+    DateTime FechaCreacion,
+    DateTime? FechaModificacion);

src/api/SIGCM2.Application/Products/List/ListProductsQuery.cs

@@ -0,0 +1,10 @@
+namespace SIGCM2.Application.Products.List;
+
+public sealed record ListProductsQuery(
+    int Page = 1,
+    int PageSize = 20,
+    bool? Activo = true,
+    string? Search = null,
+    int? MedioId = null,
+    int? ProductTypeId = null,
+    int? RubroId = null);

src/api/SIGCM2.Application/Products/List/ListProductsQueryHandler.cs

@@ -0,0 +1,35 @@
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Common;
+
+namespace SIGCM2.Application.Products.List;
+
+public sealed class ListProductsQueryHandler
+    : ICommandHandler<ListProductsQuery, PagedResult<ProductListItemDto>>
+{
+    private readonly IProductRepository _repo;
+
+    public ListProductsQueryHandler(IProductRepository repo)
+    {
+        _repo = repo;
+    }
+
+    public async Task<PagedResult<ProductListItemDto>> Handle(ListProductsQuery query)
+    {
+        var page = Math.Max(1, query.Page);
+        var pageSize = Math.Clamp(query.PageSize, 1, 100);
+
+        var repoQuery = new ProductsQuery(
+            page, pageSize, query.Activo, query.Search,
+            query.MedioId, query.ProductTypeId, query.RubroId);
+        var paged = await _repo.GetPagedAsync(repoQuery);
+
+        var items = paged.Items.Select(p => new ProductListItemDto(
+            p.Id, p.Nombre,
+            p.MedioId, p.ProductTypeId, p.RubroId,
+            p.BasePrice, p.PriceDurationDays,
+            p.IsActive)).ToList();
+
+        return new PagedResult<ProductListItemDto>(items, paged.Page, paged.PageSize, paged.Total);
+    }
+}

src/api/SIGCM2.Application/Products/List/ProductListItemDto.cs

@@ -0,0 +1,11 @@
+namespace SIGCM2.Application.Products.List;
+
+public sealed record ProductListItemDto(
+    int Id,
+    string Nombre,
+    int MedioId,
+    int ProductTypeId,
+    int? RubroId,
+    decimal BasePrice,
+    int? PriceDurationDays,
+    bool IsActive);

src/api/SIGCM2.Application/Products/NullProductQueryRepository.cs

@@ -1,14 +0,0 @@
-using SIGCM2.Application.Abstractions.Persistence;
-
-namespace SIGCM2.Application.Products;
-
-/// <summary>
-/// STUB — PRD-002 replaces the DI binding with a real Dapper impl against dbo.Product.
-/// Returns false for all queries so DeactivateProductTypeCommandHandler guard always passes.
-/// This is intentional for PRD-001: the mechanism is installed; the data feed arrives in PRD-002.
-/// </summary>
-public sealed class NullProductQueryRepository : IProductQueryRepository
-{
-    public Task<bool> ExistsActiveByProductTypeAsync(int productTypeId, CancellationToken ct = default)
-        => Task.FromResult(false);
-}

src/api/SIGCM2.Application/Products/Prices/AddPrice/AddProductPriceCommand.cs

@@ -0,0 +1,10 @@
+namespace SIGCM2.Application.Products.Prices.AddPrice;
+
+/// <summary>
+/// PRD-003 — Comando para registrar un nuevo precio histórico para un Product.
+/// Price debe ser > 0. PriceValidFrom debe ser >= hoy_AR (Cat2, TimeProvider).
+/// </summary>
+public sealed record AddProductPriceCommand(
+    int ProductId,
+    decimal Price,
+    DateOnly PriceValidFrom);

src/api/SIGCM2.Application/Products/Prices/AddPrice/AddProductPriceCommandHandler.cs

@@ -0,0 +1,92 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Domain.Entities;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Products.Prices.AddPrice;
+
+/// <summary>
+/// PRD-003 — Handler del comando AddProductPrice.
+/// Flujo: verifica producto activo → abre TransactionScope (AsyncFlow) →
+///        AddAsync (SP usp_AddProductPrice) → IAuditLogger.LogAsync (fail-closed) →
+///        tx.Complete() → construye response con GetByProductIdAsync.
+/// </summary>
+public sealed class AddProductPriceCommandHandler
+    : ICommandHandler<AddProductPriceCommand, AddProductPriceResponse>
+{
+    private readonly IProductPriceRepository _pricesRepo;
+    private readonly IProductRepository _productsRepo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public AddProductPriceCommandHandler(
+        IProductPriceRepository pricesRepo,
+        IProductRepository productsRepo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _pricesRepo = pricesRepo;
+        _productsRepo = productsRepo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<AddProductPriceResponse> Handle(AddProductPriceCommand command)
+    {
+        // 1. Producto debe existir Y estar activo (defensa Application — el SP también valida en BD).
+        var product = await _productsRepo.GetByIdAsync(command.ProductId)
+            ?? throw new ProductNotFoundException(command.ProductId);
+
+        if (!product.IsActive)
+            throw new ProductNotFoundException(command.ProductId); // inactivo = invisible para clientes
+
+        // 2. TX + SP + audit (fail-closed).
+        //    El audit.LogAsync enlista en el mismo TransactionScope — si falla, rollback total.
+        //    GetByProductIdAsync se ejecuta FUERA del scope (post-commit) para evitar
+        //    "TransactionScope is already complete" al abrir una nueva conexión dentro del using.
+        long newId;
+        long? closedId;
+        using (var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled))
+        {
+            (newId, closedId) = await _pricesRepo.AddAsync(
+                command.ProductId, command.Price, command.PriceValidFrom);
+
+            await _audit.LogAsync(
+                action: "product_price.created",
+                targetType: "ProductPrice",
+                targetId: newId.ToString(),
+                metadata: new
+                {
+                    after = new
+                    {
+                        command.ProductId,
+                        command.Price,
+                        priceValidFrom = command.PriceValidFrom.ToString("yyyy-MM-dd"),
+                    },
+                    closedPriceId = closedId
+                });
+
+            tx.Complete();
+        } // TX disposed (committed) here — BEFORE the post-commit read below.
+
+        // 3. Compongo la respuesta post-commit con lectura de historial actualizado.
+        // La primera página (pageSize=2) es suficiente: solo necesitamos el nuevo y el cerrado,
+        // que son siempre los más recientes (ORDER BY PriceValidFrom DESC).
+        var pricesPage = await _pricesRepo.GetByProductIdAsync(command.ProductId, page: 1, pageSize: 2);
+        var prices = pricesPage.Items;
+        var created = prices.Single(p => p.Id == newId);
+        var closed  = closedId.HasValue
+            ? prices.SingleOrDefault(p => p.Id == closedId.Value)
+            : null;
+
+        return new AddProductPriceResponse(ToDto(created), closed is null ? null : ToDto(closed));
+    }
+
+    private static ProductPriceDto ToDto(ProductPrice p)
+        => new(p.Id, p.ProductId, p.Price, p.PriceValidFrom, p.PriceValidTo, p.IsActive);
+}

src/api/SIGCM2.Application/Products/Prices/AddPrice/AddProductPriceCommandValidator.cs

@@ -0,0 +1,29 @@
+using FluentValidation;
+using SIGCM2.Application.Common;
+
+namespace SIGCM2.Application.Products.Prices.AddPrice;
+
+/// <summary>
+/// PRD-003 — FluentValidation validator para AddProductPriceCommand.
+/// Inyecta TimeProvider para obtener hoy_AR (Cat2, nunca DateTime.Now).
+/// FakeTimeProvider en tests garantiza determinismo.
+/// </summary>
+public sealed class AddProductPriceCommandValidator : AbstractValidator<AddProductPriceCommand>
+{
+    public AddProductPriceCommandValidator(TimeProvider timeProvider)
+    {
+        var today = timeProvider.GetArgentinaToday();
+
+        RuleFor(x => x.ProductId)
+            .GreaterThan(0)
+            .WithMessage("ProductId debe ser un entero positivo.");
+
+        RuleFor(x => x.Price)
+            .GreaterThan(0m)
+            .WithMessage("El precio debe ser mayor a cero.");
+
+        RuleFor(x => x.PriceValidFrom)
+            .GreaterThanOrEqualTo(today)
+            .WithMessage($"PriceValidFrom debe ser >= hoy ({today:yyyy-MM-dd} ART). No se permiten precios con fecha retroactiva.");
+    }
+}

src/api/SIGCM2.Application/Products/Prices/AddPrice/AddProductPriceResponse.cs

@@ -0,0 +1,9 @@
+namespace SIGCM2.Application.Products.Prices.AddPrice;
+
+/// <summary>
+/// PRD-003 — Respuesta del comando AddProductPrice.
+/// Closed es null si era el primer precio registrado para el producto.
+/// </summary>
+public sealed record AddProductPriceResponse(
+    ProductPriceDto Created,
+    ProductPriceDto? Closed);

src/api/SIGCM2.Application/Products/Prices/GetHistory/GetProductPricesQuery.cs

@@ -0,0 +1,12 @@
+namespace SIGCM2.Application.Products.Prices.GetHistory;
+
+/// <summary>
+/// PRD-003 (paginated) — Query para obtener el historial de precios de un Product.
+/// Devuelve PagedResult ordenado descending por PriceValidFrom (activo primero).
+/// Lanza ProductNotFoundException si el producto no existe.
+/// Page y PageSize son clampeados por el handler: page ≥ 1, pageSize ∈ [1, 100].
+/// </summary>
+public sealed record GetProductPricesQuery(
+    int ProductId,
+    int Page = 1,
+    int PageSize = 20);

src/api/SIGCM2.Application/Products/Prices/GetHistory/GetProductPricesQueryHandler.cs

@@ -0,0 +1,49 @@
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Common;
+using SIGCM2.Application.Products.Prices;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Products.Prices.GetHistory;
+
+/// <summary>
+/// PRD-003 (paginated) — Handler de GetProductPricesQuery.
+/// Verifica que el producto exista (404 si no), aplica clamping defensivo de
+/// page/pageSize y retorna PagedResult ordenado descending por PriceValidFrom.
+/// Lista vacía es válida (nuevo producto sin precios o página más allá del total).
+/// </summary>
+public sealed class GetProductPricesQueryHandler
+    : ICommandHandler<GetProductPricesQuery, PagedResult<ProductPriceDto>>
+{
+    private readonly IProductPriceRepository _pricesRepo;
+    private readonly IProductRepository _productsRepo;
+
+    public GetProductPricesQueryHandler(
+        IProductPriceRepository pricesRepo,
+        IProductRepository productsRepo)
+    {
+        _pricesRepo = pricesRepo;
+        _productsRepo = productsRepo;
+    }
+
+    public async Task<PagedResult<ProductPriceDto>> Handle(GetProductPricesQuery query)
+    {
+        // Verifica existencia del producto (lanza 404 si no existe).
+        _ = await _productsRepo.GetByIdAsync(query.ProductId)
+            ?? throw new ProductNotFoundException(query.ProductId);
+
+        // Clamping defensivo — igual al patrón de ListProductsQueryHandler.
+        var page = Math.Max(1, query.Page);
+        var pageSize = Math.Clamp(query.PageSize, 1, 100);
+
+        var paged = await _pricesRepo.GetByProductIdAsync(query.ProductId, page, pageSize);
+
+        var dtoItems = paged.Items
+            .Select(p => new ProductPriceDto(
+                p.Id, p.ProductId, p.Price,
+                p.PriceValidFrom, p.PriceValidTo, p.IsActive))
+            .ToList();
+
+        return new PagedResult<ProductPriceDto>(dtoItems, paged.Page, paged.PageSize, paged.Total);
+    }
+}

src/api/SIGCM2.Application/Products/Prices/ProductPriceDto.cs

@@ -0,0 +1,13 @@
+namespace SIGCM2.Application.Products.Prices;
+
+/// <summary>
+/// PRD-003 — DTO de lectura para un registro de precio histórico de Product.
+/// IsActive = true cuando PriceValidTo is null (precio vigente en curso).
+/// </summary>
+public sealed record ProductPriceDto(
+    long Id,
+    int ProductId,
+    decimal Price,
+    DateOnly PriceValidFrom,
+    DateOnly? PriceValidTo,
+    bool IsActive);

src/api/SIGCM2.Application/Products/Pricing/IProductPricingService.cs

@@ -0,0 +1,18 @@
+namespace SIGCM2.Application.Products.Pricing;
+
+/// <summary>
+/// PRD-003 — Servicio de consulta de precio vigente de un Product para una fecha civil (Cat2).
+/// Contrato forward para PRC-001 (tasación).
+///
+/// Retorna null si no existe historial de precios para el producto en la fecha indicada.
+/// La política de fallback (usar Product.BasePrice o lanzar ProductSinPrecioActivoException)
+/// queda en el consumidor (OQ-B: Product.BasePrice es ortogonal a ProductPrices).
+/// </summary>
+public interface IProductPricingService
+{
+    /// <summary>
+    /// Devuelve el precio cuya ventana [PriceValidFrom, PriceValidTo] cubre la fecha civil dada,
+    /// o null si ningún registro de precio cubre esa fecha.
+    /// </summary>
+    Task<decimal?> GetPriceAtAsync(int productId, DateOnly date, CancellationToken ct = default);
+}

src/api/SIGCM2.Application/Products/Pricing/ProductPricingService.cs

@@ -0,0 +1,24 @@
+using SIGCM2.Application.Abstractions.Persistence;
+
+namespace SIGCM2.Application.Products.Pricing;
+
+/// <summary>
+/// PRD-003 — Implementación de IProductPricingService.
+/// Delega en IProductPriceRepository.GetActiveAsync para el lookup de ventana civil.
+/// </summary>
+public sealed class ProductPricingService : IProductPricingService
+{
+    private readonly IProductPriceRepository _repo;
+
+    public ProductPricingService(IProductPriceRepository repo)
+    {
+        _repo = repo;
+    }
+
+    /// <inheritdoc />
+    public async Task<decimal?> GetPriceAtAsync(int productId, DateOnly date, CancellationToken ct = default)
+    {
+        var price = await _repo.GetActiveAsync(productId, date, ct);
+        return price?.Price;
+    }
+}

src/api/SIGCM2.Application/Products/Update/ProductUpdatedDto.cs

@@ -0,0 +1,13 @@
+namespace SIGCM2.Application.Products.Update;
+
+public sealed record ProductUpdatedDto(
+    int Id,
+    string Nombre,
+    int MedioId,
+    int ProductTypeId,
+    int? RubroId,
+    decimal BasePrice,
+    int? PriceDurationDays,
+    bool IsActive,
+    DateTime FechaCreacion,
+    DateTime? FechaModificacion);

src/api/SIGCM2.Application/Products/Update/UpdateProductCommand.cs

@@ -0,0 +1,8 @@
+namespace SIGCM2.Application.Products.Update;
+
+public sealed record UpdateProductCommand(
+    int Id,
+    string Nombre,
+    int? RubroId,
+    decimal BasePrice,
+    int? PriceDurationDays);

src/api/SIGCM2.Application/Products/Update/UpdateProductCommandHandler.cs

@@ -0,0 +1,97 @@
+using System.Transactions;
+using SIGCM2.Application.Abstractions;
+using SIGCM2.Application.Abstractions.Persistence;
+using SIGCM2.Application.Audit;
+using SIGCM2.Domain.Entities;
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Application.Products.Update;
+
+public sealed class UpdateProductCommandHandler
+    : ICommandHandler<UpdateProductCommand, ProductUpdatedDto>
+{
+    private readonly IProductRepository _repo;
+    private readonly IProductTypeRepository _ptRepo;
+    private readonly IRubroRepository _rubroRepo;
+    private readonly IAuditLogger _audit;
+    private readonly TimeProvider _timeProvider;
+
+    public UpdateProductCommandHandler(
+        IProductRepository repo,
+        IProductTypeRepository ptRepo,
+        IRubroRepository rubroRepo,
+        IAuditLogger audit,
+        TimeProvider timeProvider)
+    {
+        _repo = repo;
+        _ptRepo = ptRepo;
+        _rubroRepo = rubroRepo;
+        _audit = audit;
+        _timeProvider = timeProvider;
+    }
+
+    public async Task<ProductUpdatedDto> Handle(UpdateProductCommand command)
+    {
+        // 1. Load entity
+        var target = await _repo.GetByIdAsync(command.Id)
+            ?? throw new ProductNotFoundException(command.Id);
+
+        // 2. Load ProductType (MedioId + ProductTypeId are immutable post-creation)
+        var productType = await _ptRepo.GetByIdAsync(target.ProductTypeId)
+            ?? throw new ProductTypeNotFoundException(target.ProductTypeId);
+
+        // 3. Flags coherence
+        if (productType.RequiresCategory && !command.RubroId.HasValue)
+            throw new ProductTipoFlagsIncoherentesException(
+                $"El tipo '{productType.Nombre}' requiere RubroId (RequiresCategory=true)", "rubroId");
+
+        if (productType.HasDuration && !command.PriceDurationDays.HasValue)
+            throw new ProductTipoFlagsIncoherentesException(
+                $"El tipo '{productType.Nombre}' requiere PriceDurationDays (HasDuration=true)", "priceDurationDays");
+
+        // 4. Validate Rubro if provided: must be active
+        if (command.RubroId.HasValue)
+        {
+            var rubro = await _rubroRepo.GetByIdAsync(command.RubroId.Value);
+            if (rubro == null || !rubro.Activo)
+                throw new RubroInactivoException(command.RubroId.Value);
+        }
+
+        // 5. Duplicate nombre check (skip if name unchanged — optimization)
+        if (!string.Equals(command.Nombre, target.Nombre, StringComparison.OrdinalIgnoreCase))
+        {
+            var exists = await _repo.ExistsByNombreAsync(command.Nombre, target.MedioId, target.ProductTypeId, excludeId: command.Id);
+            if (exists)
+                throw new ProductNombreDuplicadoEnMedioTipoException(target.MedioId, target.ProductTypeId, command.Nombre);
+        }
+
+        // 6. Apply mutation (immutable)
+        var updated = target.WithUpdated(command.Nombre, command.RubroId, command.BasePrice, command.PriceDurationDays, _timeProvider);
+
+        // 7. Persist + audit
+        using var tx = new TransactionScope(
+            TransactionScopeOption.Required,
+            new TransactionOptions { IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted },
+            TransactionScopeAsyncFlowOption.Enabled);
+
+        await _repo.UpdateAsync(updated);
+
+        await _audit.LogAsync(
+            action: "producto.updated",
+            targetType: "Product",
+            targetId: command.Id.ToString(),
+            metadata: new
+            {
+                before = new { target.Nombre, target.RubroId, target.BasePrice, target.PriceDurationDays },
+                after = new { updated.Nombre, updated.RubroId, updated.BasePrice, updated.PriceDurationDays }
+            });
+
+        tx.Complete();
+
+        return new ProductUpdatedDto(
+            updated.Id, updated.Nombre,
+            updated.MedioId, updated.ProductTypeId, updated.RubroId,
+            updated.BasePrice, updated.PriceDurationDays,
+            updated.IsActive, updated.FechaCreacion, updated.FechaModificacion);
+    }
+}

src/api/SIGCM2.Application/Products/Update/UpdateProductCommandValidator.cs

@@ -0,0 +1,23 @@
+using FluentValidation;
+
+namespace SIGCM2.Application.Products.Update;
+
+public sealed class UpdateProductCommandValidator : AbstractValidator<UpdateProductCommand>
+{
+    public UpdateProductCommandValidator()
+    {
+        RuleFor(x => x.Id)
+            .GreaterThan(0).WithMessage("Id debe ser un entero positivo.");
+
+        RuleFor(x => x.Nombre)
+            .NotEmpty().WithMessage("El nombre del producto es requerido.")
+            .MaximumLength(300).WithMessage("El nombre no puede superar los 300 caracteres.");
+
+        RuleFor(x => x.BasePrice)
+            .GreaterThanOrEqualTo(0m).WithMessage("El precio base no puede ser negativo.");
+
+        RuleFor(x => x.PriceDurationDays)
+            .GreaterThan(0).When(x => x.PriceDurationDays.HasValue)
+            .WithMessage("PriceDurationDays debe ser >= 1 cuando se provee.");
+    }
+}

src/api/SIGCM2.Application/Rubros/Deactivate/DeactivateRubroCommandHandler.cs

@@ -10,15 +10,18 @@ public sealed class DeactivateRubroCommandHandler : ICommandHandler<DeactivateRu
 {
     private readonly IRubroRepository _repo;
     private readonly IAuditLogger _audit;
+    private readonly IProductQueryRepository _productQuery;
     private readonly TimeProvider _timeProvider;
 
     public DeactivateRubroCommandHandler(
         IRubroRepository repo,
         IAuditLogger audit,
+        IProductQueryRepository productQuery,
         TimeProvider timeProvider)
     {
         _repo = repo;
         _audit = audit;
+        _productQuery = productQuery;
         _timeProvider = timeProvider;
     }
 
@@ -31,6 +34,10 @@ public sealed class DeactivateRubroCommandHandler : ICommandHandler<DeactivateRu
         if (activeChildren > 0)
             throw new RubroTieneHijosActivosException(command.Id, activeChildren);
 
+        var productosActivos = await _productQuery.CountActiveByRubroAsync(command.Id);
+        if (productosActivos > 0)
+            throw new RubroConProductosActivosException(command.Id, productosActivos);
+
         var deactivated = target.WithActivo(false, _timeProvider);
 
         using var tx = new TransactionScope(

src/api/SIGCM2.Domain/Entities/Product.cs

@@ -0,0 +1,172 @@
+namespace SIGCM2.Domain.Entities;
+
+/// <summary>
+/// Immutable product entity for the commercial catalog.
+/// Factory method ForCreation creates new products (Id=0).
+/// Mutation methods (With*) return new instances — original is never modified.
+/// Flag coherence (RequiresCategory/HasDuration) is enforced by Application handlers
+/// at creation/update time against the ProductType, NOT here in the entity.
+/// MedioId and ProductTypeId are immutable post-creation by design.
+/// </summary>
+public sealed class Product
+{
+    private const int NombreMaxLength = 300;
+
+    public int Id { get; }
+    public string Nombre { get; }
+    public int MedioId { get; }
+    public int ProductTypeId { get; }
+    public int? RubroId { get; }
+    public decimal BasePrice { get; }
+    public int? PriceDurationDays { get; }
+    public bool IsActive { get; }
+    public DateTime FechaCreacion { get; }
+    public DateTime? FechaModificacion { get; }
+
+    /// <summary>Full hydration constructor — used by the repository to reconstruct from DB rows.</summary>
+    public Product(
+        int id,
+        string nombre,
+        int medioId,
+        int productTypeId,
+        int? rubroId,
+        decimal basePrice,
+        int? priceDurationDays,
+        bool isActive,
+        DateTime fechaCreacion,
+        DateTime? fechaModificacion)
+    {
+        Id = id;
+        Nombre = nombre;
+        MedioId = medioId;
+        ProductTypeId = productTypeId;
+        RubroId = rubroId;
+        BasePrice = basePrice;
+        PriceDurationDays = priceDurationDays;
+        IsActive = isActive;
+        FechaCreacion = fechaCreacion;
+        FechaModificacion = fechaModificacion;
+    }
+
+    /// <summary>
+    /// Factory for a new Product. Id=0 — DB assigns via IDENTITY.
+    /// IsActive=true, FechaModificacion=null.
+    /// </summary>
+    public static Product ForCreation(
+        string nombre,
+        int medioId,
+        int productTypeId,
+        int? rubroId,
+        decimal basePrice,
+        int? priceDurationDays,
+        TimeProvider timeProvider)
+    {
+        ValidateNombre(nombre);
+        ValidateMedioId(medioId);
+        ValidateProductTypeId(productTypeId);
+        ValidateRubroId(rubroId);
+        ValidateBasePrice(basePrice);
+        ValidatePriceDurationDays(priceDurationDays);
+
+        return new Product(
+            id: 0,
+            nombre: nombre.Trim(),
+            medioId: medioId,
+            productTypeId: productTypeId,
+            rubroId: rubroId,
+            basePrice: basePrice,
+            priceDurationDays: priceDurationDays,
+            isActive: true,
+            fechaCreacion: timeProvider.GetUtcNow().UtcDateTime,
+            fechaModificacion: null);
+    }
+
+    public Product WithRenamed(string nuevoNombre, TimeProvider timeProvider)
+    {
+        ValidateNombre(nuevoNombre);
+        return new Product(Id, nuevoNombre.Trim(), MedioId, ProductTypeId, RubroId,
+            BasePrice, PriceDurationDays, IsActive, FechaCreacion,
+            timeProvider.GetUtcNow().UtcDateTime);
+    }
+
+    public Product WithUpdatedPrice(decimal basePrice, int? priceDurationDays, TimeProvider timeProvider)
+    {
+        ValidateBasePrice(basePrice);
+        ValidatePriceDurationDays(priceDurationDays);
+        return new Product(Id, Nombre, MedioId, ProductTypeId, RubroId,
+            basePrice, priceDurationDays, IsActive, FechaCreacion,
+            timeProvider.GetUtcNow().UtcDateTime);
+    }
+
+    public Product WithUpdatedCategory(int? rubroId, TimeProvider timeProvider)
+    {
+        ValidateRubroId(rubroId);
+        return new Product(Id, Nombre, MedioId, ProductTypeId, rubroId,
+            BasePrice, PriceDurationDays, IsActive, FechaCreacion,
+            timeProvider.GetUtcNow().UtcDateTime);
+    }
+
+    /// <summary>
+    /// Combo mutator: renames, updates price and category in one call.
+    /// Used by UpdateProductCommandHandler.
+    /// </summary>
+    public Product WithUpdated(string nombre, int? rubroId, decimal basePrice, int? priceDurationDays, TimeProvider timeProvider)
+    {
+        ValidateNombre(nombre);
+        ValidateRubroId(rubroId);
+        ValidateBasePrice(basePrice);
+        ValidatePriceDurationDays(priceDurationDays);
+        return new Product(Id, nombre.Trim(), MedioId, ProductTypeId, rubroId,
+            basePrice, priceDurationDays, IsActive, FechaCreacion,
+            timeProvider.GetUtcNow().UtcDateTime);
+    }
+
+    public Product WithDeactivated(TimeProvider timeProvider)
+        => new(Id, Nombre, MedioId, ProductTypeId, RubroId,
+            BasePrice, PriceDurationDays, isActive: false, FechaCreacion,
+            timeProvider.GetUtcNow().UtcDateTime);
+
+    // ── Private validators ────────────────────────────────────────────────────
+
+    private static void ValidateNombre(string nombre)
+    {
+        if (string.IsNullOrWhiteSpace(nombre))
+            throw new ArgumentException(
+                "El Nombre del producto no puede estar vacío o ser solo espacios.", nameof(nombre));
+        if (nombre.Length > NombreMaxLength)
+            throw new ArgumentException(
+                $"El Nombre del producto no puede superar los {NombreMaxLength} caracteres.", nameof(nombre));
+    }
+
+    private static void ValidateMedioId(int medioId)
+    {
+        if (medioId <= 0)
+            throw new ArgumentException("medioId debe ser un entero positivo.", nameof(medioId));
+    }
+
+    private static void ValidateProductTypeId(int productTypeId)
+    {
+        if (productTypeId <= 0)
+            throw new ArgumentException("productTypeId debe ser un entero positivo.", nameof(productTypeId));
+    }
+
+    private static void ValidateRubroId(int? rubroId)
+    {
+        if (rubroId.HasValue && rubroId.Value <= 0)
+            throw new ArgumentException(
+                "rubroId debe ser un entero positivo cuando no es nulo.", nameof(rubroId));
+    }
+
+    private static void ValidateBasePrice(decimal basePrice)
+    {
+        if (basePrice < 0m)
+            throw new ArgumentException("basePrice no puede ser negativo.", nameof(basePrice));
+    }
+
+    private static void ValidatePriceDurationDays(int? priceDurationDays)
+    {
+        if (priceDurationDays.HasValue && priceDurationDays.Value <= 0)
+            throw new ArgumentException(
+                "priceDurationDays debe ser >= 1 cuando se provee.", nameof(priceDurationDays));
+    }
+}

src/api/SIGCM2.Domain/Entities/ProductPrice.cs

@@ -0,0 +1,25 @@
+namespace SIGCM2.Domain.Entities;
+
+/// <summary>
+/// PRD-003 — Immutable record representing a price snapshot for a Product.
+/// Business dates are Cat2 (civil Argentina dates, DateOnly). Forward-only — no mutations.
+/// PriceValidTo = null means the row is the currently active price.
+/// </summary>
+public sealed record ProductPrice(
+    long Id,
+    int ProductId,
+    decimal Price,
+    DateOnly PriceValidFrom,
+    DateOnly? PriceValidTo,
+    DateTime FechaCreacion)
+{
+    /// <summary>True if this row is the currently active price (PriceValidTo is null).</summary>
+    public bool IsActive => PriceValidTo is null;
+
+    /// <summary>
+    /// True if this price's window covers the given civil date (inclusive on both ends).
+    /// An active row (PriceValidTo = null) covers any date on or after PriceValidFrom.
+    /// </summary>
+    public bool CoversDate(DateOnly date)
+        => PriceValidFrom <= date && (PriceValidTo is null || PriceValidTo >= date);
+}

src/api/SIGCM2.Domain/Exceptions/ProductNombreDuplicadoEnMedioTipoException.cs

@@ -0,0 +1,19 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when a Product with the same Nombre already exists for a given MedioId+ProductTypeId. → HTTP 409
+/// </summary>
+public sealed class ProductNombreDuplicadoEnMedioTipoException : DomainException
+{
+    public int MedioId { get; }
+    public int ProductTypeId { get; }
+    public string Nombre { get; }
+
+    public ProductNombreDuplicadoEnMedioTipoException(int medioId, int productTypeId, string nombre)
+        : base($"Ya existe un producto activo con nombre '{nombre}' para medioId={medioId} y productTypeId={productTypeId}.")
+    {
+        MedioId = medioId;
+        ProductTypeId = productTypeId;
+        Nombre = nombre;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/ProductNotFoundException.cs

@@ -0,0 +1,15 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when a requested Product does not exist. → HTTP 404
+/// </summary>
+public sealed class ProductNotFoundException : DomainException
+{
+    public int ProductId { get; }
+
+    public ProductNotFoundException(int id)
+        : base($"El producto con id={id} no existe.")
+    {
+        ProductId = id;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/ProductPriceForwardOnlyException.cs

@@ -0,0 +1,23 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when attempting to add a ProductPrice with a PriceValidFrom that is not strictly
+/// greater than the currently active price's PriceValidFrom. → HTTP 409
+/// </summary>
+public sealed class ProductPriceForwardOnlyException : DomainException
+{
+    public int ProductId { get; }
+    public DateOnly NewPriceValidFrom { get; }
+    public DateOnly ActivePriceValidFrom { get; }
+
+    public ProductPriceForwardOnlyException(
+        int productId,
+        DateOnly newPriceValidFrom,
+        DateOnly activePriceValidFrom)
+        : base($"El nuevo PriceValidFrom ({newPriceValidFrom:yyyy-MM-dd}) debe ser estrictamente mayor al PriceValidFrom del precio activo ({activePriceValidFrom:yyyy-MM-dd}).")
+    {
+        ProductId = productId;
+        NewPriceValidFrom = newPriceValidFrom;
+        ActivePriceValidFrom = activePriceValidFrom;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/ProductPriceInvalidException.cs

@@ -0,0 +1,19 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when a ProductPrice value fails domain business validation
+/// (e.g., Price &lt;= 0, PriceValidFrom in the past). → HTTP 400
+/// Used as defense-in-depth alongside FluentValidation in the Application layer.
+/// </summary>
+public sealed class ProductPriceInvalidException : DomainException
+{
+    public string Field { get; }
+    public string Reason { get; }
+
+    public ProductPriceInvalidException(string field, string reason)
+        : base($"Valor inválido para {field}: {reason}")
+    {
+        Field = field;
+        Reason = reason;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/ProductSinPrecioActivoException.cs

@@ -0,0 +1,18 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when no ProductPrice row covers the requested date for the given product. → HTTP 404
+/// Consumers of IProductPricingService may throw this when GetPriceAtAsync returns null.
+/// </summary>
+public sealed class ProductSinPrecioActivoException : DomainException
+{
+    public int ProductId { get; }
+    public DateOnly Date { get; }
+
+    public ProductSinPrecioActivoException(int productId, DateOnly date)
+        : base($"No existe precio registrado para el producto {productId} aplicable a la fecha {date:yyyy-MM-dd}.")
+    {
+        ProductId = productId;
+        Date = date;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/ProductTipoFlagsIncoherentesException.cs

@@ -0,0 +1,16 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when a Product's field violates the flags coherence rules of its ProductType
+/// (e.g. RequiresCategory=true but RubroId is null, or HasDuration=true but PriceDurationDays is null). → HTTP 422
+/// </summary>
+public sealed class ProductTipoFlagsIncoherentesException : DomainException
+{
+    public string Field { get; }
+
+    public ProductTipoFlagsIncoherentesException(string reason, string field)
+        : base($"Incoherencia de flags del tipo de producto: {reason}.")
+    {
+        Field = field;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/ProductTypeInactivoException.cs

@@ -0,0 +1,15 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when attempting to create/update a Product referencing an inactive ProductType. → HTTP 422
+/// </summary>
+public sealed class ProductTypeInactivoException : DomainException
+{
+    public int ProductTypeId { get; }
+
+    public ProductTypeInactivoException(int productTypeId)
+        : base($"El tipo de producto con id={productTypeId} está inactivo y no puede asignarse a un producto.")
+    {
+        ProductTypeId = productTypeId;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/RubroConProductosActivosException.cs

@@ -0,0 +1,17 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when attempting to soft-delete a Rubro that still has active Products referencing it via RubroId. → HTTP 409
+/// </summary>
+public sealed class RubroConProductosActivosException : DomainException
+{
+    public int RubroId { get; }
+    public int ProductosActivosCount { get; }
+
+    public RubroConProductosActivosException(int rubroId, int productosActivosCount)
+        : base($"No se puede desactivar el rubro {rubroId}: tiene {productosActivosCount} producto(s) activo(s) referenciándolo.")
+    {
+        RubroId = rubroId;
+        ProductosActivosCount = productosActivosCount;
+    }
+}

src/api/SIGCM2.Domain/Exceptions/RubroInactivoException.cs

@@ -0,0 +1,15 @@
+namespace SIGCM2.Domain.Exceptions;
+
+/// <summary>
+/// Thrown when attempting to create/update a Product referencing an inactive Rubro. → HTTP 422
+/// </summary>
+public sealed class RubroInactivoException : DomainException
+{
+    public int RubroId { get; }
+
+    public RubroInactivoException(int rubroId)
+        : base($"El rubro con id={rubroId} está inactivo y no puede asignarse a un producto.")
+    {
+        RubroId = rubroId;
+    }
+}

src/api/SIGCM2.Domain/Pricing/ChargeableChars/ChargeableCharCategories.cs

@@ -0,0 +1,22 @@
+namespace SIGCM2.Domain.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — Canonical category names for chargeable characters.
+/// Persisted as nvarchar(32) in the database (enum-as-string).
+/// </summary>
+public static class ChargeableCharCategories
+{
+    public const string Currency    = "Currency";
+    public const string Percentage  = "Percentage";
+    public const string Exclamation = "Exclamation";
+    public const string Question    = "Question";
+    public const string Other       = "Other";
+
+    private static readonly HashSet<string> Valid = new(StringComparer.Ordinal)
+    {
+        Currency, Percentage, Exclamation, Question, Other
+    };
+
+    /// <summary>Returns true if the given category string is a known valid category.</summary>
+    public static bool IsValid(string? category) => category != null && Valid.Contains(category);
+}

src/api/SIGCM2.Domain/Pricing/ChargeableChars/ChargeableCharConfig.cs

@@ -0,0 +1,112 @@
+using SIGCM2.Domain.Pricing.Exceptions;
+
+namespace SIGCM2.Domain.Pricing.ChargeableChars;
+
+/// <summary>
+/// PRC-001 — Rich domain entity for chargeable character configuration.
+/// Represents a price-per-occurrence for a special character in classified ad text,
+/// scoped to a ProductType (ProductTypeId) or global (ProductTypeId = null).
+///
+/// Forward-only price history: each new price schedules a NEW row; the current row
+/// is closed via SP (ValidTo = newValidFrom - 1 day). ScheduleNewPrice does NOT mutate
+/// this instance — it returns a new one. The actual close+insert happens in the repository.
+///
+/// ProductTypeId = null → global default (lowest priority, overridden by per-ProductType row).
+/// </summary>
+public sealed class ChargeableCharConfig
+{
+    public long Id { get; }
+    public int? ProductTypeId { get; }
+    public string Symbol { get; }
+    public string Category { get; }
+    public decimal PricePerUnit { get; private set; }
+    public DateOnly ValidFrom { get; }
+    public DateOnly? ValidTo { get; private set; }
+    public bool IsActive { get; private set; }
+
+    private ChargeableCharConfig(
+        long id, int? productTypeId, string symbol, string category,
+        decimal price, DateOnly validFrom, DateOnly? validTo, bool isActive)
+    {
+        Id = id;
+        ProductTypeId = productTypeId;
+        Symbol = symbol;
+        Category = category;
+        PricePerUnit = price;
+        ValidFrom = validFrom;
+        ValidTo = validTo;
+        IsActive = isActive;
+    }
+
+    /// <summary>
+    /// Factory for new configs. Enforces all domain invariants.
+    /// Id is set to 0 until the entity is persisted.
+    /// </summary>
+    public static ChargeableCharConfig Create(
+        int? productTypeId, string symbol, string category, decimal price, DateOnly validFrom)
+    {
+        if (string.IsNullOrWhiteSpace(symbol))
+            throw new ChargeableCharConfigInvalidException(
+                nameof(Symbol), "Symbol no puede estar vacío.");
+
+        if (symbol.Length > 4)
+            throw new ChargeableCharConfigInvalidException(
+                nameof(Symbol), "Symbol no puede exceder 4 caracteres.");
+
+        if (price <= 0m)
+            throw new ChargeableCharConfigInvalidException(
+                nameof(PricePerUnit), "PricePerUnit debe ser > 0.");
+
+        if (!ChargeableCharCategories.IsValid(category))
+            throw new ChargeableCharConfigInvalidException(
+                nameof(Category), $"Category '{category}' inválida. Valores válidos: Currency, Percentage, Exclamation, Question, Other.");
+
+        return new ChargeableCharConfig(0, productTypeId, symbol, category, price, validFrom, null, true);
+    }
+
+    /// <summary>
+    /// Reconstructor from database (no validation). Used by the repository mapper only.
+    /// Allows creating entities with any state (e.g., IsActive=false, ValidTo set).
+    /// </summary>
+    public static ChargeableCharConfig Rehydrate(
+        long id, int? productTypeId, string symbol, string category,
+        decimal price, DateOnly validFrom, DateOnly? validTo, bool isActive)
+        => new(id, productTypeId, symbol, category, price, validFrom, validTo, isActive);
+
+    /// <summary>
+    /// Schedules a new price (forward-only semantics).
+    /// Returns a NEW ChargeableCharConfig instance with the updated price and validFrom.
+    /// This instance is NOT mutated — the close+insert of rows happens in the repository via SP.
+    ///
+    /// Validates:
+    /// - newValidFrom >= today (Argentina) via TimeProvider
+    /// - newValidFrom > current ValidFrom (strictly greater — forward-only)
+    /// - newPrice > 0
+    /// </summary>
+    public ChargeableCharConfig ScheduleNewPrice(decimal newPrice, DateOnly newValidFrom, TimeProvider timeProvider)
+    {
+        var today = timeProvider.GetArgentinaToday();
+
+        if (newValidFrom < today)
+            throw new ChargeableCharConfigInvalidException(
+                nameof(ValidFrom),
+                $"newValidFrom ({newValidFrom:yyyy-MM-dd}) debe ser >= hoy_AR ({today:yyyy-MM-dd}).");
+
+        if (newValidFrom <= ValidFrom)
+            throw new ChargeableCharConfigForwardOnlyException(ProductTypeId, Symbol, newValidFrom, ValidFrom);
+
+        // Create validates price > 0 and category — reuse factory
+        return Create(ProductTypeId, Symbol, Category, newPrice, newValidFrom);
+    }
+
+    /// <summary>
+    /// Deactivates this config row. Sets IsActive = false and ValidTo = today.
+    /// Idempotent: no-op if already inactive.
+    /// </summary>
+    public void Deactivate(DateOnly today)
+    {
+        if (!IsActive) return; // idempotent
+        IsActive = false;
+        ValidTo = today;
+    }
+}

src/api/SIGCM2.Domain/Pricing/Exceptions/ChargeableCharConfigForwardOnlyException.cs

@@ -0,0 +1,28 @@
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Domain.Pricing.Exceptions;
+
+/// <summary>
+/// PRC-001 — Thrown when attempting to schedule a new price with a ValidFrom that is
+/// not strictly greater than the currently active row's ValidFrom. → HTTP 409
+/// </summary>
+public sealed class ChargeableCharConfigForwardOnlyException : DomainException
+{
+    public int? ProductTypeId { get; }
+    public string Symbol { get; }
+    public DateOnly NewValidFrom { get; }
+    public DateOnly ActiveValidFrom { get; }
+
+    public ChargeableCharConfigForwardOnlyException(
+        int? productTypeId,
+        string symbol,
+        DateOnly newValidFrom,
+        DateOnly activeValidFrom)
+        : base($"El nuevo ValidFrom ({newValidFrom:yyyy-MM-dd}) debe ser estrictamente mayor al ValidFrom del activo ({activeValidFrom:yyyy-MM-dd}).")
+    {
+        ProductTypeId = productTypeId;
+        Symbol = symbol;
+        NewValidFrom = newValidFrom;
+        ActiveValidFrom = activeValidFrom;
+    }
+}

src/api/SIGCM2.Domain/Pricing/Exceptions/ChargeableCharConfigInvalidException.cs

@@ -0,0 +1,22 @@
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Domain.Pricing.Exceptions;
+
+/// <summary>
+/// PRC-001 — Thrown when a ChargeableCharConfig value fails domain business validation
+/// (e.g., PricePerUnit ≤ 0, Symbol empty/too long, Category unknown, ValidFrom in the past).
+/// → HTTP 400
+/// Used as defense-in-depth alongside FluentValidation in the Application layer.
+/// </summary>
+public sealed class ChargeableCharConfigInvalidException : DomainException
+{
+    public string Field { get; }
+    public string Reason { get; }
+
+    public ChargeableCharConfigInvalidException(string field, string reason)
+        : base($"Valor inválido para {field}: {reason}")
+    {
+        Field = field;
+        Reason = reason;
+    }
+}

src/api/SIGCM2.Domain/Pricing/Exceptions/ChargeableCharConfigReactivationNotAllowedException.cs

@@ -0,0 +1,29 @@
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Domain.Pricing.Exceptions;
+
+/// <summary>
+/// PRC-001 — Thrown when a reactivation attempt is blocked by a guard rule.
+/// Maps to HTTP 409.
+///
+/// Reason codes:
+///   ALREADY_ACTIVE       — target row is currently active (50410)
+///   VIGENTE_EXISTS       — a different active row exists for (ProductTypeId, Symbol) (50411)
+///   POSTERIOR_ROWS_EXIST — rows with higher ValidFrom exist after the target row (50412)
+/// </summary>
+public sealed class ChargeableCharConfigReactivationNotAllowedException : DomainException
+{
+    public long Id { get; }
+
+    /// <summary>
+    /// "ALREADY_ACTIVE" | "VIGENTE_EXISTS" | "POSTERIOR_ROWS_EXIST"
+    /// </summary>
+    public string Reason { get; }
+
+    public ChargeableCharConfigReactivationNotAllowedException(long id, string reason)
+        : base($"Reactivation not allowed for config {id}: {reason}")
+    {
+        Id = id;
+        Reason = reason;
+    }
+}

src/api/SIGCM2.Domain/Pricing/Exceptions/EmojiDetectedException.cs

@@ -0,0 +1,19 @@
+using SIGCM2.Domain.Exceptions;
+
+namespace SIGCM2.Domain.Pricing.Exceptions;
+
+/// <summary>
+/// PRC-001 — Thrown when the input text contains any Unicode emoji codepoint.
+/// Emoji detection occurs BEFORE normalization. → HTTP 400
+/// </summary>
+public sealed class EmojiDetectedException : DomainException
+{
+    /// <summary>The Unicode codepoint value of the first detected emoji rune.</summary>
+    public int DetectedCodepoint { get; }
+
+    public EmojiDetectedException(int detectedCodepoint)
+        : base($"El texto contiene emojis (U+{detectedCodepoint:X4}), que no son tarifables. Eliminálos antes de continuar.")
+    {
+        DetectedCodepoint = detectedCodepoint;
+    }
+}