Credit activity ledger: every earn and spend logged with a reason, listed under Campaigns

Hugh earned a 10-credit sign-in bonus, then bought a 280-credit extension; earned credits spend
first, so Earned read 0 and the bonus looked lost. There was no record a member could check.
Now every real credit movement writes a credit_log row (JSON store in file mode): welcome, sign-in
bonus with streak, daily claim, inbox reads, video watches, verified visits, milestone/leaderboard
bonuses, partner codes, admin/team grants, AI Copy Engine charges + refunds, flat buys (featured
run, extension, visit pack, more visits), login-ad days, and metered delivery rolled up per
campaign per day; on-chain purchased-credit spends are marked. GET /api/my/credits/activity;
dashboard shows the last 40 under Campaigns (also when there are no campaigns) with a link from
Earn credits. Chatbot canned answer + AI prompt updated; my.js tag bumped.

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

db.js

@@ -262,6 +262,18 @@ async function bootstrap() {
     burned_at BIGINT NULL,
     INDEX (burned_tx)
   ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`);
+  // credit activity ledger: one row per real credit movement (metered delivery rolls up per campaign per day)
+  await q(`CREATE TABLE IF NOT EXISTS credit_log (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    email VARCHAR(190) NOT NULL,
+    ts BIGINT NOT NULL,
+    day CHAR(10) NOT NULL,
+    delta INT NOT NULL,
+    kind VARCHAR(20) NOT NULL,
+    note VARCHAR(160) NOT NULL,
+    ref VARCHAR(40) NULL,
+    INDEX (email, ts), INDEX (email, kind, ref, day)
+  ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4`);
   // follow-up email sequence queue (one row per free account)
   await q(`CREATE TABLE IF NOT EXISTS drips (
     email VARCHAR(190) PRIMARY KEY,