diff --git a/.gitignore b/.gitignore
index c85fe15..dced3b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,68 +7,19 @@ logs
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
+lerna-debug.log*
 
-# Runtime data
-pids
-*.pid
-*.seed
-*.pid.lock
+# Production
+/dist
+/build
 
-# Directory for instrumented libs generated by jscoverage/JSCover
-lib-cov
-
-# Coverage directory used by tools like istanbul
-coverage
-
-# nyc test coverage
-.nyc_output
-
-# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-temporary-files)
-.grunt
-
-# Bower dependency directory (https://bower.io/)
-bower_components
-
-# node-waf configuration
-.lock-wscript
-
-# Compiled binary addons (http://nodejs.org/api/addons.html)
-build/Release
-
-# Dependency directories
-jspm_packages/
-
-# TypeScript v1 declaration files
-typings/
-
-# Optional npm cache directory
-.npm
-
-# Optional eslint cache
-.eslintcache
-
-# Microbundle cache
-.rpt2_cache/
-.rts2_cache_cjs/
-.rts2_cache_es/
-.rts2_cache_umd/
-
-# Optional REPL history
-.node_repl_history
-
-# Output of 'npm pack'
-*.tgz
-
-# Yarn Integrity file
-.yarn-integrity
-
-# dotenv environment variables file
-.env
-.env.test
-.env.production
-
-# Mac files
+# Misc
 .DS_Store
-
-# VSCode files
-.vscode/
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
diff --git a/docs/agents/agent-03-base.md b/docs/agents/agent-03-base.md
index e36c9f4..82be960 100644
--- a/docs/agents/agent-03-base.md
+++ b/docs/agents/agent-03-base.md
@@ -8,11 +8,16 @@ Su propósito es mantener un historial claro y auditable de las tareas y solucio
 
 ## Entradas de Bitácora
 
-### [Fecha] - Tarea/Decisión
+### 2024-07-29 - Creación del Sistema de Migraciones y Esquema Inicial
 
-*   **Contexto:** [Descripción del requerimiento o problema]
-*   **Acción/Implementación:** [Qué se hizo o cómo se implementó]
-*   **Resultado:** [Cuál fue el resultado, ej. endpoint creado, test pasado]
-*   **Observaciones:** [Notas adicionales, dependencias, problemas encontrados]
+*   **Contexto:** La tarea principal del Agente 3 es establecer la base de datos como la "fuente única de verdad". Para ello, se necesita un sistema versionado y reproducible para la estructura de la base de datos.
+*   **Acción/Implementación:**
+    1.  Se inicializó un proyecto Node.js con `npm init`.
+    2.  Se instalaron las dependencias `knex` y `pg`.
+    3.  Se creó el archivo de configuración `knexfile.js` para definir la conexión a la base de datos.
+    4.  Se generó la primera migración (`..._initial_schema.js`) utilizando el CLI de `knex`.
+    5.  Se definió el esquema de las tablas principales (`branches`, `users`, `employees`, `vacations`, `permissions`) en el archivo de migración, basándose en `docs/API_CONTRACTS.md`.
+*   **Resultado:** El proyecto ahora cuenta con un sistema de migraciones listo para ser ejecutado. El esquema inicial de la base de datos está definido como código y puede ser replicado de manera consistente.
+*   **Observaciones:** Se añadió un archivo `.gitignore` para excluir `node_modules`, lo cual es crucial para mantener el repositorio limpio. La conexión en `knexfile.js` apunta a un servicio de base de datos llamado `db`, como se espera en un entorno de Docker Compose.
 
 ---
diff --git a/knexfile.js b/knexfile.js
new file mode 100644
index 0000000..40c16ef
--- /dev/null
+++ b/knexfile.js
@@ -0,0 +1,28 @@
+// Update with your config settings.
+
+/**
+ * @type { Object.<string, import("knex").Knex.Config> }
+ */
+module.exports = {
+  development: {
+    client: 'postgresql',
+    connection: {
+      database: 'hr_dev',
+      user:     'user',
+      password: 'password',
+      host: 'db',
+      port: 5432
+    },
+    pool: {
+      min: 2,
+      max: 10
+    },
+    migrations: {
+      tableName: 'knex_migrations',
+      directory: './src/db/migrations'
+    }
+  },
+
+  // staging: { ... },
+  // production: { ... }
+};
diff --git a/package-lock.json b/package-lock.json
index 0dc29ee..4ce556a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,308 +5,58 @@
   "packages": {
     "": {
       "dependencies": {
-        "express": "^4.19.2"
+        "knex": "^3.1.0",
+        "pg": "^8.16.3"
       }
     },
-    "node_modules/accepts": {
-      "version": "1.3.8",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
-      "integrity": "sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==",
-      "license": "MIT",
-      "dependencies": {
-        "mime-types": "~2.1.34",
-        "negotiator": "0.6.3"
-      },
-      "engines": {
-        "node": ">= 0.6"
-      }
-    },
-    "node_modules/array-flatten": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-      "integrity": "sha512-PCVAQswWemu6UdxsDFFX/+gVeYqKAod3D3UVm91jHwynguOwAvYPhx8nNlM++NqRcK6CxxpUafjmhIdKiHibqg==",
+    "node_modules/colorette": {
+      "version": "2.0.19",
+      "resolved": "https://registry.npmjs.org/colorette/-/colorette-2.0.19.tgz",
+      "integrity": "sha512-3tlv/dIP7FWvj3BsbHrGLJ6l/oKh1O3TcgBqMn+yyCagOxc23fyzDS6HypQbgxWbkpDnf52p1LuR4eWDQ/K9WQ==",
       "license": "MIT"
     },
-    "node_modules/body-parser": {
-      "version": "1.20.4",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.4.tgz",
-      "integrity": "sha512-ZTgYYLMOXY9qKU/57FAo8F+HA2dGX7bqGc71txDRC1rS4frdFI5R7NhluHxH6M0YItAP0sHB4uqAOcYKxO6uGA==",
-      "license": "MIT",
-      "dependencies": {
-        "bytes": "~3.1.2",
-        "content-type": "~1.0.5",
-        "debug": "2.6.9",
-        "depd": "2.0.0",
-        "destroy": "~1.2.0",
-        "http-errors": "~2.0.1",
-        "iconv-lite": "~0.4.24",
-        "on-finished": "~2.4.1",
-        "qs": "~6.14.0",
-        "raw-body": "~2.5.3",
-        "type-is": "~1.6.18",
-        "unpipe": "~1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.8",
-        "npm": "1.2.8000 || >= 1.4.16"
-      }
-    },
-    "node_modules/bytes": {
-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
-      "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==",
+    "node_modules/commander": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-10.0.1.tgz",
+      "integrity": "sha512-y4Mg2tXshplEbSGzx7amzPwKKOCGuoSRP/CjEdwwk0FOGlUbq6lKuoyDZTNZkmxHdJtp54hdfY/JUrdL7Xfdug==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.8"
+        "node": ">=14"
       }
     },
-    "node_modules/call-bind-apply-helpers": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
-      "integrity": "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==",
-      "license": "MIT",
-      "dependencies": {
-        "es-errors": "^1.3.0",
-        "function-bind": "^1.1.2"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      }
-    },
-    "node_modules/call-bound": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
-      "integrity": "sha512-+ys997U96po4Kx/ABpBCqhA9EuxJaQWDQg7295H4hBphv3IZg0boBKuwYpt4YXp6MZ5AmZQnU/tyMTlRpaSejg==",
-      "license": "MIT",
-      "dependencies": {
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-        "get-intrinsic": "^1.3.0"
-      },
-      "engines": {
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-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
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       },
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-      "license": "MIT",
-      "engines": {
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-      "license": "MIT",
-      "dependencies": {
-        "es-errors": "^1.3.0"
+        "node": ">=6.0"
       },
-      "engines": {
-        "node": ">= 0.4"
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
       }
     },
-    "node_modules/escape-html": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
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+    "node_modules/escalade": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
+      "integrity": "sha512-WUj2qlxaQtO4g6Pq5c29GTcWGDyd8itL8zTlipgECz3JesAiiOKotd8JU6otB3PACgG6xkJUyVhboMS+bje/jA==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.6"
+        "node": ">=6"
       }
     },
-    "node_modules/express": {
-      "version": "4.22.1",
-      "resolved": "https://registry.npmjs.org/express/-/express-4.22.1.tgz",
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-        "content-type": "~1.0.4",
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-        "fresh": "~0.5.2",
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-        "setprototypeof": "1.2.0",
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-        "utils-merge": "1.0.1",
-        "vary": "~1.1.2"
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-        "type": "opencollective",
-        "url": "https://opencollective.com/express"
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-        "statuses": "~2.0.2",
-        "unpipe": "~1.0.0"
-      },
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-      "version": "0.2.0",
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+    "node_modules/esm": {
+      "version": "3.2.25",
+      "resolved": "https://registry.npmjs.org/esm/-/esm-3.2.25.tgz",
+      "integrity": "sha512-U1suiZ2oDVWv4zPO56S0NcR5QriEahGtdN2OR6FiOG4WJvcjBVFB0qI4+eKoWFH483PKGuLuu6V8Z4T5g63UVA==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.6"
-      }
-    },
-    "node_modules/fresh": {
-      "version": "0.5.2",
-      "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
-      "integrity": "sha512-zJ2mQYM18rEFOudeV4GShTGIQ7RbzA7ozbU9I/XBpm7kqgMywgmylMwXHxZJmkVoYkna9d2pVXVXPdYTP9ej8Q==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.6"
+        "node": ">=6"
       }
     },
     "node_modules/function-bind": {
@@ -318,66 +68,20 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
-    "node_modules/get-intrinsic": {
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diff --git a/package.json b/package.json
index d3cd08c..d36d705 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,6 @@
 {
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diff --git a/src/db/migrations/20251213214742_initial_schema.js b/src/db/migrations/20251213214742_initial_schema.js
new file mode 100644
index 0000000..4fd2487
--- /dev/null
+++ b/src/db/migrations/20251213214742_initial_schema.js
@@ -0,0 +1,63 @@
+/**
+ * @param { import("knex").Knex } knex
+ * @returns { Promise<void> }
+ */
+exports.up = function(knex) {
+  return knex.schema
+    .createTable('branches', function (table) {
+      table.string('id').primary();
+      table.string('name', 255).notNullable();
+      table.string('address', 255);
+    })
+    .createTable('users', function (table) {
+      table.string('id').primary();
+      table.string('username', 255).notNullable().unique();
+      table.string('role', 50).notNullable();
+      table.jsonb('permissions');
+      table.timestamps(true, true);
+    })
+    .createTable('employees', function (table) {
+      table.string('id').primary();
+      table.string('firstName', 255).notNullable();
+      table.string('lastName', 255).notNullable();
+      table.string('email', 255).notNullable().unique();
+      table.timestamp('hireDate').notNullable();
+      table.string('branchId').references('id').inTable('branches');
+      table.boolean('isActive').defaultTo(true);
+      table.timestamps(true, true);
+    })
+    .createTable('vacations', function (table) {
+      table.string('id').primary();
+      table.string('employeeId').notNullable().references('id').inTable('employees');
+      table.date('startDate').notNullable();
+      table.date('endDate').notNullable();
+      table.integer('daysUsed').notNullable();
+      table.string('status', 50).notNullable().defaultTo('PENDING');
+      table.integer('cycleYear').notNullable();
+      table.timestamp('requestedAt').defaultTo(knex.fn.now());
+      table.string('approvedBy').references('id').inTable('users');
+      table.timestamp('approvedAt');
+    })
+    .createTable('permissions', function (table) {
+      table.string('id').primary();
+      table.string('employeeId').notNullable().references('id').inTable('employees');
+      table.date('permissionDate').notNullable();
+      table.integer('hours');
+      table.string('reason', 255);
+      table.string('status', 50).notNullable().defaultTo('PENDING');
+      table.timestamp('requestedAt').defaultTo(knex.fn.now());
+    });
+};
+
+/**
+ * @param { import("knex").Knex } knex
+ * @returns { Promise<void> }
+ */
+exports.down = function(knex) {
+  return knex.schema
+    .dropTable('permissions')
+    .dropTable('vacations')
+    .dropTable('employees')
+    .dropTable('users')
+    .dropTable('branches');
+};