chore: consolidate platform split checks

src/govoplan_core/db/session.py

@@ -38,15 +38,21 @@ class DatabaseHandle:
         with self.SessionLocal() as session:
             yield session
 
+    def dispose(self) -> None:
+        self.engine.dispose()
+
 
 _default_database: DatabaseHandle | None = None
 
 
-def configure_database(database_url: str, *, engine: Engine | None = None) -> DatabaseHandle:
+def configure_database(database_url: str, *, engine: Engine | None = None, dispose_previous: bool = False) -> DatabaseHandle:
     global _default_database
     if engine is None and _default_database is not None and _default_database.database_url == database_url:
         return _default_database
+    previous_database = _default_database
     _default_database = DatabaseHandle(database_url, engine=engine)
+    if dispose_previous and previous_database is not None and previous_database is not _default_database:
+        previous_database.dispose()
     return _default_database
 
 
@@ -56,6 +62,13 @@ def set_database(handle: DatabaseHandle) -> DatabaseHandle:
     return handle
 
 
+def reset_database(*, dispose: bool = False) -> None:
+    global _default_database
+    if dispose and _default_database is not None:
+        _default_database.dispose()
+    _default_database = None
+
+
 def get_database() -> DatabaseHandle:
     if _default_database is None:
         raise RuntimeError("GovOPlaN database is not configured")