Add social features and harden beta release

db/migrations/10_release_safety.sql

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+ALTER TABLE users
+DROP COLUMN IF EXISTS email_verified;
+
+CREATE TABLE IF NOT EXISTS account_tokens (
+    id SERIAL PRIMARY KEY,
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    purpose VARCHAR(30) NOT NULL CHECK (purpose = 'password_reset'),
+    token_hash TEXT NOT NULL UNIQUE,
+    expires_at TIMESTAMP NOT NULL,
+    used_at TIMESTAMP,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+DELETE FROM account_tokens WHERE purpose = 'verify_email';
+
+ALTER TABLE account_tokens DROP CONSTRAINT IF EXISTS account_tokens_purpose_check;
+ALTER TABLE account_tokens ADD CONSTRAINT account_tokens_purpose_check
+CHECK (purpose = 'password_reset');
+
+CREATE INDEX IF NOT EXISTS idx_account_tokens_lookup
+ON account_tokens (token_hash, purpose, expires_at);
+
+ALTER TABLE concert_attendance
+DROP CONSTRAINT IF EXISTS concert_attendance_status_check;
+
+ALTER TABLE concert_attendance
+ADD CONSTRAINT concert_attendance_status_check
+CHECK (status IN ('attending', 'maybe', 'ticket_search', 'ticket_offer'));