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-2db59a4a696bb287f8df30c0605c157de8cfe1b140c73869e0388605fa2389f3.json

@@ -0,0 +1,27 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "INSERT INTO users_redeemals\n            (user_id, offer, redeemed, status, last_attempt, n_attempts)\n            VALUES ($1, $2, $3, $4, $5, $6)\n            RETURNING id\n            ",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "id",
+        "type_info": "Int4"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Int8",
+        "Varchar",
+        "Timestamptz",
+        "Varchar",
+        "Timestamptz",
+        "Int4"
+      ]
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "2db59a4a696bb287f8df30c0605c157de8cfe1b140c73869e0388605fa2389f3"
+}