Merge parents caches into the current task one

Closes #45 (closed)

tests/conftest.py

@@ -302,10 +302,10 @@ def mock_databases(tmpdir):
         filename = "db_42.sqlite" if name == "chunk_42" else "db.sqlite"
         path = tmpdir / name / filename
         (tmpdir / name).mkdir()
-        local_db = SqliteDatabase(None)
-        local_db.init(path, pragmas={})
-        local_db.connect()
+        local_db = SqliteDatabase(path)
         with local_db.bind_ctx(MODELS):
+            # Create tables on the current local database
+            # by binding temporarily the models on that database
             local_db.create_tables(MODELS)
         out[name] = {"path": path, "db": local_db}