diff --git a/apps/api/package.json b/apps/api/package.json
index b955fb6..1830326 100644
--- a/apps/api/package.json
+++ b/apps/api/package.json
@@ -30,6 +30,7 @@
     "jsonwebtoken": "^9.0.2",
     "node-cron": "^4.2.1",
     "node-forge": "^1.3.3",
+    "pg": "^8.18.0",
     "zod": "^3.23.0"
   },
   "devDependencies": {
@@ -41,6 +42,7 @@
     "@types/node": "^22.0.0",
     "@types/node-cron": "^3.0.11",
     "@types/node-forge": "^1.3.14",
+    "@types/pg": "^8.18.0",
     "prisma": "^5.22.0",
     "tsx": "^4.19.0",
     "typescript": "^5.3.0"
diff --git a/apps/api/src/config/database.ts b/apps/api/src/config/database.ts
index df46150..788f169 100644
--- a/apps/api/src/config/database.ts
+++ b/apps/api/src/config/database.ts
@@ -1,4 +1,10 @@
 import { PrismaClient } from '@prisma/client';
+import { Pool, type PoolConfig } from 'pg';
+import { env } from './env.js';
+
+// ===========================================
+// Prisma Client (central database: horux360)
+// ===========================================
 
 declare global {
   var prisma: PrismaClient | undefined;
@@ -11,3 +17,303 @@ export const prisma = globalThis.prisma || new PrismaClient({
 if (process.env.NODE_ENV !== 'production') {
   globalThis.prisma = prisma;
 }
+
+// ===========================================
+// TenantConnectionManager (per-tenant DBs)
+// ===========================================
+
+interface PoolEntry {
+  pool: Pool;
+  lastAccess: Date;
+}
+
+function parseDatabaseUrl(url: string) {
+  const parsed = new URL(url);
+  return {
+    host: parsed.hostname,
+    port: parseInt(parsed.port || '5432'),
+    user: decodeURIComponent(parsed.username),
+    password: decodeURIComponent(parsed.password),
+  };
+}
+
+class TenantConnectionManager {
+  private pools: Map<string, PoolEntry> = new Map();
+  private cleanupInterval: NodeJS.Timeout | null = null;
+  private dbConfig: { host: string; port: number; user: string; password: string };
+
+  constructor() {
+    this.dbConfig = parseDatabaseUrl(env.DATABASE_URL);
+    this.cleanupInterval = setInterval(() => this.cleanupIdlePools(), 60_000);
+  }
+
+  /**
+   * Get or create a connection pool for a tenant's database.
+   */
+  getPool(tenantId: string, databaseName: string): Pool {
+    const entry = this.pools.get(tenantId);
+    if (entry) {
+      entry.lastAccess = new Date();
+      return entry.pool;
+    }
+
+    const poolConfig: PoolConfig = {
+      host: this.dbConfig.host,
+      port: this.dbConfig.port,
+      user: this.dbConfig.user,
+      password: this.dbConfig.password,
+      database: databaseName,
+      max: 3,
+      idleTimeoutMillis: 300_000,
+      connectionTimeoutMillis: 10_000,
+    };
+
+    const pool = new Pool(poolConfig);
+
+    pool.on('error', (err) => {
+      console.error(`[TenantDB] Pool error for tenant ${tenantId} (${databaseName}):`, err.message);
+    });
+
+    this.pools.set(tenantId, { pool, lastAccess: new Date() });
+    return pool;
+  }
+
+  /**
+   * Create a new database for a tenant with all required tables and indexes.
+   */
+  async provisionDatabase(rfc: string): Promise<string> {
+    const databaseName = `horux_${rfc.toLowerCase().replace(/[^a-z0-9]/g, '')}`;
+
+    const adminPool = new Pool({
+      ...this.dbConfig,
+      database: 'postgres',
+      max: 1,
+    });
+
+    try {
+      const exists = await adminPool.query(
+        `SELECT 1 FROM pg_database WHERE datname = $1`,
+        [databaseName]
+      );
+
+      if (exists.rows.length > 0) {
+        throw new Error(`Database ${databaseName} already exists`);
+      }
+
+      await adminPool.query(`CREATE DATABASE "${databaseName}"`);
+
+      const tenantPool = new Pool({
+        ...this.dbConfig,
+        database: databaseName,
+        max: 1,
+      });
+
+      try {
+        await this.createTables(tenantPool);
+        await this.createIndexes(tenantPool);
+      } finally {
+        await tenantPool.end();
+      }
+
+      return databaseName;
+    } finally {
+      await adminPool.end();
+    }
+  }
+
+  /**
+   * Soft-delete: rename database so it can be recovered.
+   */
+  async deprovisionDatabase(databaseName: string): Promise<void> {
+    // Close any active pool for this tenant
+    for (const [tenantId, entry] of this.pools.entries()) {
+      // We check pool config to match the database
+      if ((entry.pool as any).options?.database === databaseName) {
+        await entry.pool.end().catch(() => {});
+        this.pools.delete(tenantId);
+      }
+    }
+
+    const timestamp = Date.now();
+    const adminPool = new Pool({
+      ...this.dbConfig,
+      database: 'postgres',
+      max: 1,
+    });
+
+    try {
+      await adminPool.query(`
+        SELECT pg_terminate_backend(pid)
+        FROM pg_stat_activity
+        WHERE datname = $1 AND pid <> pg_backend_pid()
+      `, [databaseName]);
+
+      await adminPool.query(
+        `ALTER DATABASE "${databaseName}" RENAME TO "${databaseName}_deleted_${timestamp}"`
+      );
+    } finally {
+      await adminPool.end();
+    }
+  }
+
+  /**
+   * Invalidate (close and remove) a specific tenant's pool.
+   */
+  invalidatePool(tenantId: string): void {
+    const entry = this.pools.get(tenantId);
+    if (entry) {
+      entry.pool.end().catch(() => {});
+      this.pools.delete(tenantId);
+    }
+  }
+
+  /**
+   * Remove idle pools (not accessed in last 5 minutes).
+   */
+  private cleanupIdlePools(): void {
+    const now = Date.now();
+    const maxIdle = 5 * 60 * 1000;
+
+    for (const [tenantId, entry] of this.pools.entries()) {
+      if (now - entry.lastAccess.getTime() > maxIdle) {
+        entry.pool.end().catch((err) =>
+          console.error(`[TenantDB] Error closing idle pool for ${tenantId}:`, err.message)
+        );
+        this.pools.delete(tenantId);
+      }
+    }
+  }
+
+  /**
+   * Graceful shutdown: close all pools.
+   */
+  async shutdown(): Promise<void> {
+    if (this.cleanupInterval) {
+      clearInterval(this.cleanupInterval);
+    }
+
+    const closePromises = Array.from(this.pools.values()).map((entry) =>
+      entry.pool.end()
+    );
+    await Promise.all(closePromises);
+    this.pools.clear();
+  }
+
+  /**
+   * Get stats about active pools.
+   */
+  getStats(): { activePools: number; tenantIds: string[] } {
+    return {
+      activePools: this.pools.size,
+      tenantIds: Array.from(this.pools.keys()),
+    };
+  }
+
+  private async createTables(pool: Pool): Promise<void> {
+    await pool.query(`
+      CREATE TABLE IF NOT EXISTS cfdis (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        uuid_fiscal VARCHAR(36) UNIQUE NOT NULL,
+        tipo VARCHAR(20) NOT NULL DEFAULT 'ingreso',
+        serie VARCHAR(25),
+        folio VARCHAR(40),
+        fecha_emision TIMESTAMP NOT NULL,
+        fecha_timbrado TIMESTAMP,
+        rfc_emisor VARCHAR(13) NOT NULL,
+        nombre_emisor VARCHAR(300) NOT NULL,
+        rfc_receptor VARCHAR(13) NOT NULL,
+        nombre_receptor VARCHAR(300) NOT NULL,
+        subtotal DECIMAL(18,2) DEFAULT 0,
+        descuento DECIMAL(18,2) DEFAULT 0,
+        iva DECIMAL(18,2) DEFAULT 0,
+        isr_retenido DECIMAL(18,2) DEFAULT 0,
+        iva_retenido DECIMAL(18,2) DEFAULT 0,
+        total DECIMAL(18,2) DEFAULT 0,
+        moneda VARCHAR(10) DEFAULT 'MXN',
+        tipo_cambio DECIMAL(10,4) DEFAULT 1,
+        metodo_pago VARCHAR(10),
+        forma_pago VARCHAR(10),
+        uso_cfdi VARCHAR(10),
+        estado VARCHAR(20) DEFAULT 'vigente',
+        xml_url TEXT,
+        pdf_url TEXT,
+        xml_original TEXT,
+        created_at TIMESTAMP DEFAULT NOW(),
+        updated_at TIMESTAMP DEFAULT NOW(),
+        last_sat_sync TIMESTAMP,
+        sat_sync_job_id UUID,
+        source VARCHAR(20) DEFAULT 'manual'
+      );
+
+      CREATE TABLE IF NOT EXISTS iva_mensual (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        año INTEGER NOT NULL,
+        mes INTEGER NOT NULL,
+        iva_trasladado DECIMAL(18,2) DEFAULT 0,
+        iva_acreditable DECIMAL(18,2) DEFAULT 0,
+        iva_retenido DECIMAL(18,2) DEFAULT 0,
+        resultado DECIMAL(18,2) DEFAULT 0,
+        acumulado DECIMAL(18,2) DEFAULT 0,
+        estado VARCHAR(20) DEFAULT 'pendiente',
+        fecha_declaracion TIMESTAMP,
+        UNIQUE(año, mes)
+      );
+
+      CREATE TABLE IF NOT EXISTS isr_mensual (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        año INTEGER NOT NULL,
+        mes INTEGER NOT NULL,
+        ingresos_acumulados DECIMAL(18,2) DEFAULT 0,
+        deducciones DECIMAL(18,2) DEFAULT 0,
+        base_gravable DECIMAL(18,2) DEFAULT 0,
+        isr_causado DECIMAL(18,2) DEFAULT 0,
+        isr_retenido DECIMAL(18,2) DEFAULT 0,
+        isr_a_pagar DECIMAL(18,2) DEFAULT 0,
+        estado VARCHAR(20) DEFAULT 'pendiente',
+        fecha_declaracion TIMESTAMP,
+        UNIQUE(año, mes)
+      );
+
+      CREATE TABLE IF NOT EXISTS alertas (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        tipo VARCHAR(50) NOT NULL,
+        titulo VARCHAR(200) NOT NULL,
+        mensaje TEXT,
+        prioridad VARCHAR(20) DEFAULT 'media',
+        fecha_vencimiento TIMESTAMP,
+        leida BOOLEAN DEFAULT FALSE,
+        resuelta BOOLEAN DEFAULT FALSE,
+        created_at TIMESTAMP DEFAULT NOW()
+      );
+
+      CREATE TABLE IF NOT EXISTS calendario_fiscal (
+        id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+        titulo VARCHAR(200) NOT NULL,
+        descripcion TEXT,
+        tipo VARCHAR(50) NOT NULL,
+        fecha_limite TIMESTAMP NOT NULL,
+        recurrencia VARCHAR(20) DEFAULT 'unica',
+        completado BOOLEAN DEFAULT FALSE,
+        notas TEXT,
+        created_at TIMESTAMP DEFAULT NOW()
+      );
+    `);
+  }
+
+  private async createIndexes(pool: Pool): Promise<void> {
+    await pool.query(`CREATE EXTENSION IF NOT EXISTS pg_trgm`);
+
+    await pool.query(`
+      CREATE INDEX IF NOT EXISTS idx_cfdis_fecha_emision ON cfdis(fecha_emision DESC);
+      CREATE INDEX IF NOT EXISTS idx_cfdis_tipo ON cfdis(tipo);
+      CREATE INDEX IF NOT EXISTS idx_cfdis_rfc_emisor ON cfdis(rfc_emisor);
+      CREATE INDEX IF NOT EXISTS idx_cfdis_rfc_receptor ON cfdis(rfc_receptor);
+      CREATE INDEX IF NOT EXISTS idx_cfdis_estado ON cfdis(estado);
+      CREATE INDEX IF NOT EXISTS idx_cfdis_nombre_emisor_trgm ON cfdis USING gin(nombre_emisor gin_trgm_ops);
+      CREATE INDEX IF NOT EXISTS idx_cfdis_nombre_receptor_trgm ON cfdis USING gin(nombre_receptor gin_trgm_ops);
+    `);
+  }
+}
+
+// Singleton instance
+export const tenantDb = new TenantConnectionManager();
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 71278d8..243e083 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -68,6 +68,9 @@ importers:
       node-forge:
         specifier: ^1.3.3
         version: 1.3.3
+      pg:
+        specifier: ^8.18.0
+        version: 8.18.0
       zod:
         specifier: ^3.23.0
         version: 3.25.76
@@ -96,6 +99,9 @@ importers:
       '@types/node-forge':
         specifier: ^1.3.14
         version: 1.3.14
+      '@types/pg':
+        specifier: ^8.18.0
+        version: 8.18.0
       prisma:
         specifier: ^5.22.0
         version: 5.22.0
@@ -1106,6 +1112,9 @@ packages:
   '@types/pako@2.0.4':
     resolution: {integrity: sha512-VWDCbrLeVXJM9fihYodcLiIv0ku+AlOa/TQ1SvYOaBuyrSKgEcro95LJyIsJ4vSo6BXIxOKxiJAat04CmST9Fw==}
 
+  '@types/pg@8.18.0':
+    resolution: {integrity: sha512-gT+oueVQkqnj6ajGJXblFR4iavIXWsGAFCk3dP4Kki5+a9R4NMt0JARdk6s8cUKcfUoqP5dAtDSLU8xYUTFV+Q==}
+
   '@types/prop-types@15.7.15':
     resolution: {integrity: sha512-F6bEyamV9jKGAFBEmlQnesRPGOQqS2+Uwi0Em15xenOxHaf2hv6L8YCVn3rPdPJOiJfPiCnLIRyvwVaqMY3MIw==}
 
@@ -3369,6 +3378,12 @@ snapshots:
 
   '@types/pako@2.0.4': {}
 
+  '@types/pg@8.18.0':
+    dependencies:
+      '@types/node': 22.19.7
+      pg-protocol: 1.11.0
+      pg-types: 2.2.0
+
   '@types/prop-types@15.7.15': {}
 
   '@types/qs@6.14.0': {}