Offers, redemption, preview subscriptions (#4121)

* Initial db migration/impl, guarded partner routes

* Add guard to /redeem

* Add `public` column to products prices, only expose public prices

* Query cache

* Add partner subscription type

* 5 days subscription interval, metadata

* Create server on redeem

* Query cache

* Fix race condition

* Unprovision Medal subscriptions

* Consider due expiring charge as unprovisionable

* Query cache

* Use a queue

* Promote to full subscription, fmt + clippy

* Patch expiring charge on promotion, comments

* Additional comments

* Add `tags` field to Archon /create request

* Address review comments

* Query cache

* Final fixes to edit_subscription

* Appease clippy

* fmt

apps/labrinth/.sqlx/query-1dea22589b0440cfeaf98b6869bdaad852d58c61cf2a1affb01acc4984d42341.json

@@ -0,0 +1,15 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "\n            UPDATE users_redeemals\n            SET status = $1\n            WHERE\n              status = $2\n              AND NOW() - last_attempt > INTERVAL '5 minutes'\n            ",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Left": [
+        "Varchar",
+        "Text"
+      ]
+    },
+    "nullable": []
+  },
+  "hash": "1dea22589b0440cfeaf98b6869bdaad852d58c61cf2a1affb01acc4984d42341"
+}