lifecycle: clean full redis as part of system migration

lifecycle/system_migrations/to_0_13_authentik.py

@@ -1,4 +1,7 @@
 # flake8: noqa
+from redis import Redis
+
+from authentik.lib.config import CONFIG
 from lifecycle.migrate import BaseMigration
 
 SQL_STATEMENT = """BEGIN TRANSACTION;
@@ -103,3 +106,16 @@ class Migration(BaseMigration):
     def run(self):
         self.cur.execute(SQL_STATEMENT)
         self.con.commit()
+        # We also need to clean the cache to make sure no pickeled objects still exist
+        for db in [
+            CONFIG.y("redis.message_queue_db"),
+            CONFIG.y("redis.cache_db"),
+            CONFIG.y("redis.ws_db"),
+        ]:
+            redis = Redis(
+                host=CONFIG.y("redis.host"),
+                port=6379,
+                db=db,
+                password=CONFIG.y("redis.password"),
+            )
+            redis.flushall()