diff --git a/docs/agents/agent-03-base.md b/docs/agents/agent-03-base.md
index c6f23a7..1d6ae78 100644
--- a/docs/agents/agent-03-base.md
+++ b/docs/agents/agent-03-base.md
@@ -8,7 +8,7 @@ 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:** Se necesitaba una base de datos y un modelo de datos para poder continuar con el desarrollo de la aplicación.
 *   **Acción/Implementación:**
diff --git a/package-lock.json b/package-lock.json
index c75c56f..2a5d7d6 100644
--- a/package-lock.json
+++ b/package-lock.json
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+        "node": ">=6"
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-      "license": "MIT",
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@@ -1689,13 +1612,26 @@
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-        "ee-first": "1.1.1"
+        "colorette": "2.0.19",
+        "commander": "^10.0.0",
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+        "escalade": "^3.1.1",
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+        "getopts": "2.3.0",
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@@ -1978,21 +1893,30 @@
           "type": "github",
           "url": "https://github.com/sponsors/feross"
         },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
+        "pg": {
+          "optional": true
         },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
+        "pg-native": {
+          "optional": true
+        },
+        "sqlite3": {
+          "optional": true
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+        "tedious": {
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+        "postgres-array": "~2.0.0",
+        "postgres-bytea": "~1.0.0",
+        "postgres-date": "~1.0.4",
+        "postgres-interval": "^1.1.0"
       },
       "engines": {
-        "node": ">= 0.8.0"
+        "node": ">=4"
       }
     },
-    "node_modules/serve-static/node_modules/send/node_modules/encodeurl": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
-      "integrity": "sha512-TPJXq8JqFaVYm2CWmPvnP2Iyo4ZSM7/QKcSmuMLDObfpH5fi7RUGmd/rTDf+rut/saiDiQEeVTNgAmJEdAOx0w==",
+    "node_modules/pg/node_modules/pg-connection-string": {
+      "version": "2.9.1",
+      "resolved": "https://registry.npmjs.org/pg-connection-string/-/pg-connection-string-2.9.1.tgz",
+      "integrity": "sha512-nkc6NpDcvPVpZXxrreI/FOtX3XemeLl8E0qFr6F2Lrm/I8WOnaWNhIPK2Z7OHpw7gh5XJThi6j6ppgNoaT1w4w==",
+      "license": "MIT"
+    },
+    "node_modules/pgpass": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/pgpass/-/pgpass-1.0.5.tgz",
+      "integrity": "sha512-FdW9r/jQZhSeohs1Z3sI1yxFQNFvMcnmfuj4WBMUTxOrAyLMaTcE1aAMBiTlbMNaXvBCQuVi0R7hd8udDSP7ug==",
       "license": "MIT",
-      "engines": {
-        "node": ">= 0.8"
+      "dependencies": {
+        "split2": "^4.1.0"
       }
     },
-    "node_modules/serve-static/node_modules/statuses": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
-      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ==",
+    "node_modules/postgres-array": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/postgres-array/-/postgres-array-2.0.0.tgz",
+      "integrity": "sha512-VpZrUqU5A69eQyW2c5CA1jtLecCsN2U/bD6VilrFDWq5+5UIEVO7nazS3TEcHf1zuPYO/sqGvUvW62g86RXZuA==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.8"
+        "node": ">=4"
+      }
+    },
+    "node_modules/postgres-bytea": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/postgres-bytea/-/postgres-bytea-1.0.0.tgz",
+      "integrity": "sha512-xy3pmLuQqRBZBXDULy7KbaitYqLcmxigw14Q5sj8QBVLqEwXfeybIKVWiqAXTlcvdvb0+xkOtDbfQMOf4lST1w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
       }
     },
     "node_modules/set-blocking": {
@@ -2159,65 +2062,46 @@
       "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
       "integrity": "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw==",
       "license": "MIT",
-      "dependencies": {
-        "es-errors": "^1.3.0",
-        "object-inspect": "^1.13.3",
-        "side-channel-list": "^1.0.0",
-        "side-channel-map": "^1.0.1",
-        "side-channel-weakmap": "^1.0.2"
-      },
       "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
+        "node": ">=0.10.0"
       }
     },
-    "node_modules/side-channel-list": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.0.tgz",
-      "integrity": "sha512-FCLHtRD/gnpCiCHEiJLOwdmFP+wzCmDEkc9y7NsYxeF4u7Btsn1ZuwgwJGxImImHicJArLP4R0yX4c2KCrMrTA==",
+    "node_modules/postgres-interval": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/postgres-interval/-/postgres-interval-1.2.0.tgz",
+      "integrity": "sha512-9ZhXKM/rw350N1ovuWHbGxnGh/SNJ4cnxHiM0rxE4VN41wsg8P8zWn9hv/buK00RP4WvlOyr/RBDiptyxVbkZQ==",
       "license": "MIT",
       "dependencies": {
-        "es-errors": "^1.3.0",
-        "object-inspect": "^1.13.3"
+        "xtend": "^4.0.0"
       },
       "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
+        "node": ">=0.10.0"
       }
     },
-    "node_modules/side-channel-map": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/side-channel-map/-/side-channel-map-1.0.1.tgz",
-      "integrity": "sha512-VCjCNfgMsby3tTdo02nbjtM/ewra6jPHmpThenkTYh8pG9ucZ/1P8So4u4FGBek/BjpOVsDCMoLA/iuBKIFXRA==",
+    "node_modules/rechoir": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/rechoir/-/rechoir-0.8.0.tgz",
+      "integrity": "sha512-/vxpCXddiX8NGfGO/mTafwjq4aFa/71pvamip0++IQk3zG8cbCj0fifNPrjjF1XMXUne91jL9OoxmdykoEtifQ==",
       "license": "MIT",
       "dependencies": {
-        "call-bound": "^1.0.2",
-        "es-errors": "^1.3.0",
-        "get-intrinsic": "^1.2.5",
-        "object-inspect": "^1.13.3"
+        "resolve": "^1.20.0"
       },
       "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
+        "node": ">= 10.13.0"
       }
     },
-    "node_modules/side-channel-weakmap": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/side-channel-weakmap/-/side-channel-weakmap-1.0.2.tgz",
-      "integrity": "sha512-WPS/HvHQTYnHisLo9McqBHOJk2FkHO/tlpvldyrnem4aeQp4hai3gythswg6p01oSoTl58rcpiFAjF2br2Ak2A==",
+    "node_modules/resolve": {
+      "version": "1.22.11",
+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.11.tgz",
+      "integrity": "sha512-RfqAvLnMl313r7c9oclB1HhUEAezcpLjz95wFH4LVuhk9JF/r22qmVP9AMmOU4vMX7Q8pN8jwNg/CSpdFnMjTQ==",
       "license": "MIT",
       "dependencies": {
-        "call-bound": "^1.0.2",
-        "es-errors": "^1.3.0",
-        "get-intrinsic": "^1.2.5",
-        "object-inspect": "^1.13.3",
-        "side-channel-map": "^1.0.1"
+        "is-core-module": "^2.16.1",
+        "path-parse": "^1.0.7",
+        "supports-preserve-symlinks-flag": "^1.0.0"
+      },
+      "bin": {
+        "resolve": "bin/resolve"
       },
       "engines": {
         "node": ">= 0.4"
@@ -2387,7 +2271,7 @@
       "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.8"
+        "node": ">=8"
       }
     },
     "node_modules/string_decoder": {
@@ -2532,7 +2416,7 @@
       "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
       "license": "MIT",
       "engines": {
-        "node": ">=0.6"
+        "node": ">= 10.x"
       }
     },
     "node_modules/tunnel-agent": {
@@ -2552,12 +2436,11 @@
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
       "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
       "license": "MIT",
-      "dependencies": {
-        "media-typer": "0.3.0",
-        "mime-types": "~2.1.24"
-      },
       "engines": {
-        "node": ">= 0.6"
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
       }
     },
     "node_modules/unique-filename": {
@@ -2586,7 +2469,7 @@
       "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.8"
+        "node": ">=8.0.0"
       }
     },
     "node_modules/util-deprecate": {
@@ -2601,16 +2484,16 @@
       "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.4.0"
+        "node": ">=8"
       }
     },
-    "node_modules/vary": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
-      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+    "node_modules/xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
       "license": "MIT",
       "engines": {
-        "node": ">= 0.8"
+        "node": ">=0.4"
       }
     },
     "node_modules/which": {
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');
+};