Version 4.0.0 (#263)

* fix: lock_tables acquires dedicated session to enforce RAII lock boundaries (#261)

* fix: make lock_tables generic over session type (#270)

* docs: fix zensical warnings

* Version 4.0.0

* docs: add v4 migration + fix lock_tables documentation

docs/migration/v4.md

@@ -0,0 +1,40 @@
+# Migrating to v4.0
+
+This page covers every breaking change introduced in **v4.0** and the steps required to update your code.
+
+---
+
+## Database
+
+### `lock_tables` now takes a `session_maker` instead of a `session`
+
+The first argument of `lock_tables` changed from an `AsyncSession` instance to an `async_sessionmaker`.
+The function creates and manages its own **dedicated session** internally, yielding it to the caller.
+
+=== "Before (`v3`)"
+
+    ```python
+    from fastapi_toolsets.db import lock_tables, LockMode
+
+    async with lock_tables(session=session, tables=[User, Account]):
+        user = await UserCrud.get(session, [User.id == 1])
+        user.balance += 100
+
+    # With a custom lock mode
+    async with lock_tables(session, [Order], mode=LockMode.EXCLUSIVE):
+        await process_order(session, order_id)
+    ```
+
+=== "Now (`v4`)"
+
+    ```python
+    from fastapi_toolsets.db import lock_tables, LockMode
+
+    async with lock_tables(session_maker=session_maker, tables=[User, Account]) as session:
+        user = await UserCrud.get(session, [User.id == 1])
+        user.balance += 100
+
+    # With a custom lock mode
+    async with lock_tables(session_maker, [Order], mode=LockMode.EXCLUSIVE) as session:
+        await process_order(session, order_id)
+    ```