fix(billing): reset usage on transition from free -> paid plan (#1397)

* fix(billing): reset usage on transition from free -> paid plan

* fixes: pro->team upgrade logic, single org server side check on invite routes

* ui improvements

* cleanup team-members code

* minor renaming

* progress

* fix pro->team upgrade to prevent double billing

* add subscription delete case handler

---------

Co-authored-by: Vikhyath Mondreti <vikhyath@simstudio.ai>

packages/db/migrations/0091_amusing_iron_lad.sql

@@ -0,0 +1 @@
+ALTER TABLE "user_stats" ADD COLUMN "pro_period_cost_snapshot" numeric DEFAULT '0';

packages/db/migrations/meta/_journal.json

@@ -631,6 +631,13 @@
       "when": 1757805452908,
       "tag": "0090_fearless_zaladane",
       "breakpoints": true
+    },
+    {
+      "idx": 91,
+      "version": "7",
+      "when": 1758567567287,
+      "tag": "0091_amusing_iron_lad",
+      "breakpoints": true
     }
   ]
 }

packages/db/schema.ts

@@ -565,6 +565,8 @@ export const userStats = pgTable('user_stats', {
   // Billing period tracking
   currentPeriodCost: decimal('current_period_cost').notNull().default('0'), // Usage in current billing period
   lastPeriodCost: decimal('last_period_cost').default('0'), // Usage from previous billing period
+  // Pro usage snapshot when joining a team (to prevent double-billing)
+  proPeriodCostSnapshot: decimal('pro_period_cost_snapshot').default('0'), // Snapshot of Pro usage when joining team
   // Copilot usage tracking
   totalCopilotCost: decimal('total_copilot_cost').notNull().default('0'),
   totalCopilotTokens: integer('total_copilot_tokens').notNull().default(0),