feat: real audit_log with redaction + pending_changes; replace stub

lib/db/repos/audit.js

@@ -0,0 +1,72 @@
+import { pool } from '../pool.js';
+
+const REDACT_KEYS = new Set([
+  'token','token_hash','password','api_key','secret','authorization'
+]);
+
+function isSensitiveKey(k) {
+  return REDACT_KEYS.has(String(k).toLowerCase());
+}
+
+function redactValueForKey(k, v) {
+  if (isSensitiveKey(k)) return '[REDACTED]';
+  return redact(v);
+}
+
+function redact(obj) {
+  if (!obj || typeof obj !== 'object') return obj;
+  if (Array.isArray(obj)) return obj.map(redact);
+  const out = {};
+  for (const [k, v] of Object.entries(obj)) {
+    out[k] = redactValueForKey(k, v);
+  }
+  return out;
+}
+
+function diff(before, after) {
+  if (before === null && after === null) return null;
+  if (before === null || before === undefined) return { kind: 'create', after: redact(after) };
+  if (after === null || after === undefined) return { kind: 'delete', before: redact(before) };
+  const changed = {};
+  for (const k of new Set([...Object.keys(before), ...Object.keys(after)])) {
+    if (JSON.stringify(before[k]) !== JSON.stringify(after[k])) {
+      changed[k] = {
+        before: redactValueForKey(k, before[k]),
+        after: redactValueForKey(k, after[k])
+      };
+    }
+  }
+  return Object.keys(changed).length ? { kind: 'update', changes: changed } : null;
+}
+
+export async function recordAudit(actor, action, entity_type, entity_id, before, after) {
+  const d = diff(before, after);
+  await pool.query(
+    `INSERT INTO audit_log(actor_kind, actor_id, entity_type, entity_id, action, diff)
+     VALUES($1,$2,$3,$4,$5,$6)`,
+    [actor?.kind || 'system', actor?.id || null, entity_type, entity_id, action, d]
+  );
+}
+
+export async function listForEntity(entity_type, entity_id, { limit = 100 } = {}) {
+  const { rows } = await pool.query(
+    `SELECT * FROM audit_log WHERE entity_type=$1 AND entity_id=$2
+     ORDER BY occurred_at DESC LIMIT $3`,
+    [entity_type, entity_id, limit]
+  );
+  return rows;
+}
+
+export async function listByActor({ actor_kind, actor_id, limit = 100 } = {}) {
+  const where = [], vals = [];
+  let i = 1;
+  if (actor_kind) { where.push(`actor_kind=$${i++}`); vals.push(actor_kind); }
+  if (actor_id) { where.push(`actor_id=$${i++}`); vals.push(actor_id); }
+  vals.push(limit);
+  const w = where.length ? `WHERE ${where.join(' AND ')}` : '';
+  const { rows } = await pool.query(
+    `SELECT * FROM audit_log ${w} ORDER BY occurred_at DESC LIMIT $${i}`,
+    vals
+  );
+  return rows;
+}