init commit

migrations/env.py

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+# migrations/env.py
+import os
+from logging.config import fileConfig
+from dotenv import load_dotenv
+from alembic import context
+from sqlalchemy import create_engine, pool
+
+# 1) Берём Base из session.py
+from app.db.session import Base
+
+load_dotenv()
+
+# 2) Импортируем сборщик моделей, чтобы metadata увидело всё
+import app.db.base  # noqa: F401
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+
+def build_sync_url() -> str:
+    """
+    Возвращает sync-URL для Alembic.
+    Приоритет:
+    1) DATABASE_URL_SYNC (полная строка)
+    2) Конструктор из DB_HOST/DB_PORT/DB_NAME/DB_USER/DB_PASSWORD
+    """
+    env_url = os.getenv("DATABASE_URL_SYNC")
+    if env_url and "://" in env_url:
+        return env_url
+
+    host = os.getenv("DB_HOST")
+    port = os.getenv("DB_PORT", "3306")
+    name = os.getenv("DB_NAME")
+    user = os.getenv("DB_USER")
+    pwd = os.getenv("DB_PASSWORD")
+
+    if host and name and user is not None and pwd is not None:
+        # ВАЖНО: для Alembic нужна sync-строка с PyMySQL
+        return f"mariadb+pymysql://{user}:{pwd}@{host}:{port}/{name}"
+
+    raise RuntimeError(
+        "No valid sync DB URL. Set DATABASE_URL_SYNC or DB_HOST/DB_PORT/DB_NAME/DB_USER/DB_PASSWORD."
+    )
+
+
+def run_migrations_offline() -> None:
+    url = build_sync_url()
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "pyformat"},
+        compare_type=True,
+        compare_server_default=True,
+    )
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    url = build_sync_url()
+
+    connectable = create_engine(
+        url,
+        future=True,
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            compare_type=True,
+            compare_server_default=True,
+        )
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()