Save database.db to upload dir, not code dir

src/render_queue.py

@@ -1,4 +1,5 @@
 import logging
+import os
 from datetime import datetime
 
 from sqlalchemy import create_engine
@@ -18,10 +19,8 @@ class JobNotFoundError(Exception):
 
 
 class RenderQueue:
-    engine = create_engine('sqlite:///database.db')
-    Base.metadata.create_all(engine)
-    Session = sessionmaker(bind=engine)
-    session = Session()
+    engine = None
+    session = None
     job_queue = []
     maximum_renderer_instances = {'blender': 1, 'aerender': 1, 'ffmpeg': 4}
     last_saved_counts = {}
@@ -30,7 +29,11 @@ class RenderQueue:
         pass
 
     @classmethod
-    def start_queue(cls):
+    def start_queue(cls, database_directory):
+        if not cls.engine:
+            cls.engine = create_engine(f"sqlite:///{os.path.join(database_directory, 'database.db')}")
+            Base.metadata.create_all(cls.engine)
+            cls.session = sessionmaker(bind=cls.engine)()
         cls.load_state()
 
     @classmethod