[db] Wrap SQL statements into connection.begin() blocks.

The latest release of SQLAlchemy 2.x has apparently removed the
`autocommit` implicit logic for good.

Mutations should be explicitly wrapped into `with ... begin()` blocks,
or they will be rolled back when the connection is closed.

platypush/plugins/db/__init__.py

@@ -105,7 +105,9 @@ class DbPlugin(Plugin):
             (see https:///docs.sqlalchemy.org/en/latest/core/engines.html)
         """
 
-        with self.get_engine(engine, *args, **kwargs).connect() as connection:
+        with self.get_engine(
+            engine, *args, **kwargs
+        ).connect() as connection, connection.begin():
             connection.execute(text(statement))
 
     def _get_table(self, table: str, *args, engine=None, **kwargs):
@@ -324,7 +326,7 @@ class DbPlugin(Plugin):
         update_records = []
         returned_records = []
 
-        with engine.connect() as connection:
+        with engine.connect() as connection, connection.begin():
             # Upsert case
             if key_columns:
                 insert_records, update_records = self._get_new_and_existing_records(
@@ -462,7 +464,7 @@ class DbPlugin(Plugin):
                 }
         """
         engine = self.get_engine(engine, *args, **kwargs)
-        with engine.connect() as connection:
+        with engine.connect() as connection, connection.begin():
             table, engine = self._get_table(table, *args, engine=engine, **kwargs)
             return self._update(connection, table, records, key_columns)
 
@@ -505,7 +507,7 @@ class DbPlugin(Plugin):
 
         engine = self.get_engine(engine, *args, **kwargs)
 
-        with engine.connect() as connection:
+        with engine.connect() as connection, connection.begin():
             for record in records:
                 table_, engine = self._get_table(table, *args, engine=engine, **kwargs)
                 delete = table_.delete()