diff --git a/database/migrations/V001__create_usuario.sql b/database/migrations/V001__create_usuario.sql
new file mode 100644
index 0000000..0f3b16e
--- /dev/null
+++ b/database/migrations/V001__create_usuario.sql
@@ -0,0 +1,43 @@
+-- V001__create_usuario.sql
+-- Creates the core Usuario table for SIG-CM2
+-- Run on: SIGCM2 (prod) and SIGCM2_Test (integration tests)
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+GO
+
+IF OBJECT_ID('dbo.Usuario', 'U') IS NULL
+BEGIN
+    CREATE TABLE dbo.Usuario (
+        Id                INT IDENTITY(1,1)   NOT NULL CONSTRAINT PK_Usuario PRIMARY KEY,
+        Username          NVARCHAR(50)        NOT NULL,
+        PasswordHash      NVARCHAR(255)       NOT NULL,
+        Nombre            NVARCHAR(100)       NOT NULL,
+        Apellido          NVARCHAR(100)       NOT NULL,
+        Email             NVARCHAR(150)       NULL,
+        Rol               VARCHAR(30)         NOT NULL,
+        PermisosJson      NVARCHAR(MAX)       NOT NULL CONSTRAINT DF_Usuario_Permisos DEFAULT('[]'),
+        Activo            BIT                 NOT NULL CONSTRAINT DF_Usuario_Activo DEFAULT(1),
+        FechaCreacion     DATETIME2(3)        NOT NULL CONSTRAINT DF_Usuario_FechaCreacion DEFAULT(SYSUTCDATETIME()),
+        FechaModificacion DATETIME2(3)        NULL,
+        UltimoLogin       DATETIME2(3)        NULL,
+        CONSTRAINT UQ_Usuario_Username UNIQUE (Username),
+        CONSTRAINT CK_Usuario_Rol CHECK (Rol IN ('admin','vendedor','tasador','consulta'))
+    );
+
+    PRINT 'Table dbo.Usuario created successfully.';
+END
+ELSE
+BEGIN
+    PRINT 'Table dbo.Usuario already exists — skipping.';
+END
+GO
+
+IF NOT EXISTS (SELECT 1 FROM sys.indexes WHERE name = 'IX_Usuario_Username_Activo' AND object_id = OBJECT_ID('dbo.Usuario'))
+BEGIN
+    CREATE INDEX IX_Usuario_Username_Activo
+        ON dbo.Usuario(Username)
+        WHERE Activo = 1;
+    PRINT 'Index IX_Usuario_Username_Activo created.';
+END
+GO
diff --git a/database/seeds/S001__seed_admin.sql b/database/seeds/S001__seed_admin.sql
new file mode 100644
index 0000000..844b29a
--- /dev/null
+++ b/database/seeds/S001__seed_admin.sql
@@ -0,0 +1,30 @@
+-- S001__seed_admin.sql
+-- Seeds the default admin user for SIG-CM2
+-- BCrypt hash of '@Diego550@' at cost 12
+-- Generated: 2026-04-13
+
+SET QUOTED_IDENTIFIER ON;
+SET ANSI_NULLS ON;
+SET NOCOUNT ON;
+GO
+
+IF NOT EXISTS (SELECT 1 FROM dbo.Usuario WHERE Username = 'admin')
+BEGIN
+    INSERT INTO dbo.Usuario (Username, PasswordHash, Nombre, Apellido, Email, Rol, PermisosJson, Activo)
+    VALUES (
+        'admin',
+        '$2a$12$rmq6tlSAQ8WXhR2CwLCSeuwCJKz/.8Eab95UQCUNfwe4dokeOqMcW',
+        'Administrador',
+        'Sistema',
+        NULL,
+        'admin',
+        '["*"]',
+        1
+    );
+    PRINT 'Admin user seeded successfully.';
+END
+ELSE
+BEGIN
+    PRINT 'Admin user already exists — skipping.';
+END
+GO