Campaigns: optional daily cap on banner/text paces spend on-site and hands Network Ad Space one day's allowance at a time

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

db.js

@@ -120,6 +120,9 @@ async function bootstrap() {
   await alterSafe('ALTER TABLE campaigns ADD COLUMN expires BIGINT NULL'); // featured rotation end time
   await alterSafe('ALTER TABLE campaigns ADD COLUMN starts BIGINT NULL');  // featured run start (booked day)
   await alterSafe('ALTER TABLE campaigns ADD COLUMN house TINYINT NOT NULL DEFAULT 0'); // admin house ad: free, never charged
+  await alterSafe('ALTER TABLE campaigns ADD COLUMN daily_cap INT NULL');      // optional credits/day pacing (banner + text)
+  await alterSafe('ALTER TABLE campaigns ADD COLUMN day_spent INT NOT NULL DEFAULT 0');
+  await alterSafe("ALTER TABLE campaigns ADD COLUMN day_key CHAR(10) NULL");
   // linked positions: extra wallets owned by one email account (Qualified Start).
   // Each is its own on-chain member sponsored by the account's main member.
   await q(`CREATE TABLE IF NOT EXISTS positions (