Add PATCH note route and row_count to change log

- PATCH /api/log/:logid — saves note updates to pf.log (was missing, frontend call was silently failing)
- GET /api/versions/:id/log — joins fc_table to return row_count per entry so the change log modal shows rows affected instead of '—'

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

routes/log.js

@@ -4,11 +4,31 @@ const { fcTable } = require('../lib/utils');
 module.exports = function(pool) {
     const router = express.Router();
 
-    // list all log entries for a version, newest first
+    // list all log entries for a version, newest first, with row counts from fc_table
     router.get('/versions/:id/log', async (req, res) => {
         try {
+            const verResult = await pool.query(`
+                SELECT v.*, s.tname
+                FROM pf.version v
+                JOIN pf.source s ON s.id = v.source_id
+                WHERE v.id = $1
+            `, [req.params.id]);
+            if (verResult.rows.length === 0) return res.status(404).json({ error: 'Version not found' });
+
+            const { tname, id: version_id } = verResult.rows[0];
+            const table = fcTable(tname, version_id);
+
             const result = await pool.query(
-                `SELECT * FROM pf.log WHERE version_id = $1 ORDER BY stamp DESC`,
+                `SELECT l.*,
+                        counts.row_count
+                 FROM pf.log l
+                 LEFT JOIN (
+                     SELECT pf_logid, count(*)::int AS row_count
+                     FROM ${table}
+                     GROUP BY pf_logid
+                 ) counts ON counts.pf_logid = l.id
+                 WHERE l.version_id = $1
+                 ORDER BY l.stamp DESC`,
                 [req.params.id]
             );
             res.json(result.rows);
@@ -18,6 +38,22 @@ module.exports = function(pool) {
         }
     });
 
+    // update note on a log entry
+    router.patch('/log/:logid', async (req, res) => {
+        const { note } = req.body;
+        try {
+            const result = await pool.query(
+                `UPDATE pf.log SET note = $1 WHERE id = $2 RETURNING *`,
+                [note ?? null, parseInt(req.params.logid)]
+            );
+            if (result.rows.length === 0) return res.status(404).json({ error: 'Log entry not found' });
+            res.json(result.rows[0]);
+        } catch (err) {
+            console.error(err);
+            res.status(500).json({ error: err.message });
+        }
+    });
+
     // undo an operation — deletes all forecast rows with this logid, then the log entry
     // two separate queries in a transaction to avoid FK ordering issues
     router.delete('/log/:logid', async (req, res) => {