Prepare ERP source for Gitea deployment

scripts/migrate_up.bat

@@ -0,0 +1,9 @@
+@echo off
+setlocal
+alembic upgrade head
+if %errorlevel% neq 0 (
+  echo Migration failed.
+  exit /b %errorlevel%
+)
+echo Migration complete.
+endlocal

scripts/new_migration.bat

@@ -0,0 +1,8 @@
+@echo off
+setlocal
+if "%~1"=="" (
+  echo Usage: new_migration.bat "message"
+  exit /b 1
+)
+alembic revision --autogenerate -m "%~1"
+endlocal

scripts/verify_client_associations.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+from sqlalchemy import select, func
+
+from app.core.db.common import CommonSessionLocal
+from app.modules.clients.association_models import ClientAssociation
+from app.modules.clients.models import Client
+
+
+def main():
+    db = CommonSessionLocal()
+    try:
+        total_clients = db.execute(select(func.count()).select_from(Client)).scalar_one()
+        total_assoc = db.execute(select(func.count()).select_from(ClientAssociation)).scalar_one()
+        missing = db.execute(select(Client.id, Client.client_code, Client.client_name).outerjoin(ClientAssociation, ClientAssociation.client_id == Client.id).where(ClientAssociation.id.is_(None))).all()
+        print(f"Total clients       : {total_clients}")
+        print(f"Total associations  : {total_assoc}")
+        print(f"Missing associations: {len(missing)}")
+        for row in missing[:50]:
+            print(f"- {row.id} | {row.client_code} | {row.client_name}")
+    finally:
+        db.close()
+
+
+if __name__ == '__main__':
+    main()