feat: locked-feature upgrade prompts route to billing + track upgrade interest (v0.81.0)

UpgradeDialog's CTA now sends users to Settings > Billing (with a feature-specific banner) instead of a generic support-ticket prefill, and fires a best-effort tracking beacon recording which feature triggered the click. New feature_upgrade_clicks table + Admin > Insights chart ("Most-requested locked features") gives admins visibility into which locked features actually drive upgrade interest.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/db/src/migrations/0065_cooing_carnage.sql

@@ -0,0 +1,8 @@
+CREATE TABLE "feature_upgrade_clicks" (
+	"id" text PRIMARY KEY NOT NULL,
+	"user_id" text NOT NULL,
+	"feature_key" text NOT NULL,
+	"created_at" timestamp DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "feature_upgrade_clicks" ADD CONSTRAINT "feature_upgrade_clicks_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;

packages/db/src/migrations/meta/_journal.json

@@ -456,6 +456,13 @@
       "when": 1784885885146,
       "tag": "0064_thick_drax",
       "breakpoints": true
+    },
+    {
+      "idx": 65,
+      "version": "7",
+      "when": 1784894764837,
+      "tag": "0065_cooing_carnage",
+      "breakpoints": true
     }
   ]
 }

packages/db/src/schema/feature-flags.ts

@@ -18,3 +18,17 @@ export const featureFlags = pgTable("feature_flags", {
 export const featureFlagsRelations = relations(featureFlags, ({ one }) => ({
   updatedBy: one(users, { fields: [featureFlags.updatedById], references: [users.id] }),
 }));
+
+// One row per "I'm interested" click from a locked-feature upgrade dialog —
+// lets admins see which locked features are actually driving upgrade
+// interest (Admin -> Insights), not just that upgrades happen.
+export const featureUpgradeClicks = pgTable("feature_upgrade_clicks", {
+  id: text("id").primaryKey(),
+  userId: text("user_id").notNull().references(() => users.id, { onDelete: "cascade" }),
+  featureKey: text("feature_key").notNull(),
+  createdAt: timestamp("created_at").notNull().defaultNow(),
+});
+
+export const featureUpgradeClicksRelations = relations(featureUpgradeClicks, ({ one }) => ({
+  user: one(users, { fields: [featureUpgradeClicks.userId], references: [users.id] }),
+}));