Use msgpack for jobs

pyproject.toml

@@ -20,6 +20,7 @@ ormar = {extras = ["postgresql"], version = "^0.12.0"}
 greenlet = "^2.0.1"
 pydantic = "1.10.2"
 redis = {extras = ["hiredis"], version = "^4.4.0"}
+msgpack = "^1.0.4"
 
 [tool.poetry.dev-dependencies]
 

src/core/setup_arq.py

@@ -1,3 +1,5 @@
+import msgpack
+
 from app.services.cache_updater import (
     check_books,
     cache_file_by_book_id,
@@ -28,5 +30,7 @@ class WorkerSettings:
     on_shutdown = shutdown
     redis_settings = get_redis_settings()
     max_jobs = 2
-    max_tries = 3
+    max_tries = 1
     job_timeout = 10 * 60
+    job_serializer = msgpack.packb
+    job_deserializer = lambda b: msgpack.unpackb(b, raw=False)  # noqa: E731