FASE 4-5-6: Infraestructura, CRM, Service Orders, Notificaciones, Ahorro, Logistica, API Publica

FASE 4:
- Redis cache de stock con fallback graceful
- Multi-moneda (MXN/USD) con contabilidad en MXN
- Proveedores y ordenes de compra completo
- Meilisearch 1.5M+ partes indexadas
- Metabase KPIs con dashboard auto-generado

FASE 5:
- CRM mejorado: activities, tags, loyalty program, analytics
- Imagenes de partes: upload, resize, thumbnails WebP
- Ordenes de servicio Kanban: received->diagnosis->repair->ready->delivered
- Garantias/RMA, alertas de reorden, multi-sucursal
- Stubs BNPL (APLAZO) y ERP Sync (Aspel/Contpaqi)

FASE 6:
- Notificaciones automaticas: push/WhatsApp/email/in-app
- Reportes de ahorro vs retail_price
- Logistica + tracking: DHL, FedEx, Estafeta, 99min, Uber
- API Publica: API keys, rate limiting, catalog search

Migraciones: v1.9-v3.0
Tests: 93/93 pasando
Backup: nexus_backup_20260427_045859.tar.gz

pos/migrations/runner_master.py

@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+# /home/Autopartes/pos/migrations/runner_master.py
+"""Apply schema migrations to the master database (nexus_autoparts)."""
+
+import os
+import sys
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from tenant_db import get_master_conn
+
+MIGRATIONS_DIR = os.path.dirname(os.path.abspath(__file__))
+
+# Master DB migration registry: version -> filename
+MASTER_MIGRATIONS = {
+    'v1.6': 'v1.6_marketplace.sql',
+}
+
+
+def get_current_master_version():
+    """Get current schema version of master DB."""
+    conn = get_master_conn()
+    cur = conn.cursor()
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS master_schema_version (
+            id INTEGER PRIMARY KEY CHECK (id = 1),
+            version VARCHAR(20) NOT NULL DEFAULT 'v0.0',
+            updated_at TIMESTAMPTZ DEFAULT NOW()
+        )
+    """)
+    cur.execute("""
+        INSERT INTO master_schema_version (id, version)
+        VALUES (1, 'v0.0')
+        ON CONFLICT (id) DO NOTHING
+    """)
+    conn.commit()
+    cur.execute("SELECT version FROM master_schema_version WHERE id = 1")
+    version = cur.fetchone()[0]
+    cur.close()
+    conn.close()
+    return version
+
+
+def apply_master_migration(version):
+    """Apply a single migration to the master DB."""
+    filename = MASTER_MIGRATIONS[version]
+    filepath = os.path.join(MIGRATIONS_DIR, filename)
+
+    if not os.path.exists(filepath):
+        print(f"  ERROR: Migration file not found: {filepath}")
+        return False
+
+    conn = get_master_conn()
+    cur = conn.cursor()
+    try:
+        with open(filepath) as f:
+            cur.execute(f.read())
+        conn.commit()
+        return True
+    except Exception as e:
+        conn.rollback()
+        print(f"  ERROR: {e}")
+        return False
+    finally:
+        cur.close()
+        conn.close()
+
+
+def run_master_migrations():
+    """Apply pending migrations to master DB."""
+    current_version = get_current_master_version()
+    sorted_versions = sorted(MASTER_MIGRATIONS.keys())
+
+    print(f"Master DB current version: {current_version}")
+    print(f"Available migrations: {sorted_versions}")
+
+    for version in sorted_versions:
+        if version <= current_version:
+            continue
+
+        print(f"  Applying {version}...", end=' ')
+        if apply_master_migration(version):
+            conn = get_master_conn()
+            cur = conn.cursor()
+            cur.execute("""
+                INSERT INTO master_schema_version (id, version)
+                VALUES (1, %s)
+                ON CONFLICT (id) DO UPDATE SET version = %s, updated_at = NOW()
+            """, (version, version))
+            conn.commit()
+            cur.close()
+            conn.close()
+            print("OK")
+        else:
+            print("FAILED — stopping master migrations")
+            break
+
+    print("Done.")
+
+
+if __name__ == '__main__':
+    run_master_migrations()