Add consented social milestone posting

sql/2026-08-13_social_milestones.sql

@@ -0,0 +1,30 @@
+-- Success-sharing milestones. Run once against the target database before
+-- deploying the application version that uses this feature.
+ALTER TABLE "User" ADD COLUMN IF NOT EXISTS "xHandle" TEXT;
+ALTER TABLE "User" ADD COLUMN IF NOT EXISTS "socialPromptOptOut" BOOLEAN NOT NULL DEFAULT false;
+
+CREATE TABLE IF NOT EXISTS "SocialMilestone" (
+  "id" TEXT PRIMARY KEY,
+  "qrId" TEXT NOT NULL REFERENCES "QRCode"("id") ON DELETE CASCADE,
+  "userId" TEXT NOT NULL REFERENCES "User"("id") ON DELETE CASCADE,
+  "kind" TEXT NOT NULL,
+  "status" TEXT NOT NULL DEFAULT 'detected',
+  "detectedAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  "shownAt" TIMESTAMP(3),
+  "respondedAt" TIMESTAMP(3),
+  "postedAt" TIMESTAMP(3),
+  "withName" BOOLEAN NOT NULL DEFAULT false,
+  "consentText" TEXT,
+  CONSTRAINT "SocialMilestone_qr_kind_key" UNIQUE ("qrId", "kind")
+);
+
+CREATE INDEX IF NOT EXISTS "SocialMilestone_status_respondedAt_idx"
+  ON "SocialMilestone" ("status", "respondedAt");
+CREATE INDEX IF NOT EXISTS "SocialMilestone_userId_status_idx"
+  ON "SocialMilestone" ("userId", "status");
+
+ALTER TABLE "SocialMilestone" ADD COLUMN IF NOT EXISTS "claimedAt" TIMESTAMP(3);
+ALTER TABLE "SocialMilestone" ADD COLUMN IF NOT EXISTS "language" TEXT NOT NULL DEFAULT 'en';
+ALTER TABLE "SocialMilestone" ADD COLUMN IF NOT EXISTS "cardData" JSONB;
+CREATE INDEX IF NOT EXISTS "SocialMilestone_status_claimedAt_idx"
+  ON "SocialMilestone" ("status", "claimedAt");