Fix postgres DNS: put both services on dokploy-network

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/entrypoint.sh

@@ -3,19 +3,50 @@ set -e
 
 echo "==> VpnPanel starting"
 
-# Always build DATABASE_URL from POSTGRES_* (Dokploy-friendly)
+DB_HOST="${POSTGRES_HOST:-postgres}"
+DB_PORT="${POSTGRES_PORT:-5432}"
+DB_USER="${POSTGRES_USER:-vpn}"
+DB_PASS="${POSTGRES_PASSWORD:-vpn}"
+DB_NAME="${POSTGRES_DB:-vpn_panel}"
+
 export DATABASE_URL="$(
+  POSTGRES_HOST="$DB_HOST" \
+  POSTGRES_PORT="$DB_PORT" \
+  POSTGRES_USER="$DB_USER" \
+  POSTGRES_PASSWORD="$DB_PASS" \
+  POSTGRES_DB="$DB_NAME" \
   python - <<'PY'
 import os
 from urllib.parse import quote_plus
 
-user = os.environ.get("POSTGRES_USER", "vpn")
-password = os.environ.get("POSTGRES_PASSWORD", "vpn")
-db = os.environ.get("POSTGRES_DB", "vpn_panel")
-print(f"postgresql+asyncpg://{quote_plus(user)}:{quote_plus(password)}@postgres:5432/{db}")
+host = os.environ["POSTGRES_HOST"]
+port = os.environ["POSTGRES_PORT"]
+user = os.environ["POSTGRES_USER"]
+password = os.environ["POSTGRES_PASSWORD"]
+db = os.environ["POSTGRES_DB"]
+print(
+    f"postgresql+asyncpg://{quote_plus(user)}:{quote_plus(password)}"
+    f"@{host}:{port}/{db}"
+)
 PY
 )"
 
+echo "DB target: ${DB_USER}@${DB_HOST}:${DB_PORT}/${DB_NAME}"
+
+echo "DNS check..."
+python - <<'PY'
+import os
+import socket
+
+host = os.environ.get("POSTGRES_HOST", "postgres")
+try:
+    infos = socket.getaddrinfo(host, None)
+    addrs = sorted({i[4][0] for i in infos})
+    print(f"Resolved {host} -> {', '.join(addrs)}")
+except Exception as exc:  # noqa: BLE001
+    print(f"WARNING: cannot resolve '{host}': {exc}")
+PY
+
 echo "Waiting for database..."
 python - <<'PY'
 import asyncio
@@ -38,9 +69,11 @@ async def wait_db(retries: int = 60) -> None:
             return
         except Exception as exc:  # noqa: BLE001
             print(f"DB not ready ({i + 1}/{retries}): {exc}")
-            await asyncio.sleep(1)
+            await asyncio.sleep(2)
     await engine.dispose()
     print("ERROR: database did not become ready", file=sys.stderr)
+    print("HINT: both panel and postgres must be on dokploy-network", file=sys.stderr)
+    print("HINT: in Dokploy set POSTGRES_HOST if DB service name differs", file=sys.stderr)
     sys.exit(1)