feat: aktualisiere SRS-Logik zur Verwendung von konfigurierbaren Zeitfenstern für die Auswahl und Aktualisierung von Elementen

backend/scripts/fix-srs-queries.sql

@@ -1,23 +1,34 @@
--- Fix items that were created with next_due_at ~= created_at (within 2 minutes)
--- Run this after a backup. Adjust the WHERE clause if you want a different window.
+
+-- Fix items that were created with next_due_at ~= created_at
+-- Run this after a backup. Edit the two variables below to widen/narrow the search.
+
+-- CONFIG: adjust as needed
+\set LOOKBACK_DAYS 365
+\set WINDOW_SECONDS 10
 
 BEGIN;
 
 -- Preview rows to be changed
 SELECT id, item_key, course_id, stage, next_due_at, created_at
 FROM community.vocab_srs_item
-WHERE created_at >= now() - interval '3 days'
-  AND abs(EXTRACT(EPOCH FROM (next_due_at - created_at))) < 120
+WHERE created_at >= now() - make_interval(days => :LOOKBACK_DAYS)
+  AND (
+    next_due_at = created_at
+    OR abs(EXTRACT(EPOCH FROM (next_due_at - created_at))) <= :WINDOW_SECONDS
+  )
 ORDER BY created_at ASC
 LIMIT 200;
 
 -- Conservative update: set next_due_at to next calendar day at 08:00
 UPDATE community.vocab_srs_item
 SET next_due_at = date_trunc('day', created_at + interval '1 day') + interval '8 hours'
-WHERE created_at >= now() - interval '3 days'
-  AND abs(EXTRACT(EPOCH FROM (next_due_at - created_at))) < 120
+WHERE created_at >= now() - make_interval(days => :LOOKBACK_DAYS)
+  AND (
+    next_due_at = created_at
+    OR abs(EXTRACT(EPOCH FROM (next_due_at - created_at))) <= :WINDOW_SECONDS
+  )
 RETURNING id, item_key, course_id, stage, next_due_at, created_at;
 
 COMMIT;
 
--- After running, re-run backend/scripts/diag-srs-stats.js to validate counts.
+-- After running, re-run `node backend/scripts/diag-srs-stats.js` to validate counts.