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

backend/scripts/fix-srs-queries-plain.sql

@@ -0,0 +1,36 @@
+-- Plain SQL version of fix-srs-queries.sql for clients that don't support psql meta-commands
+-- Configure the two variables below before running (edit them in the file):
+--   set lookback_days = 365; set window_seconds = 10;
+
+-- Edit these values as needed
+-- Configure the two variables below before running (edit them in the file):
+--   set lookback_days = 365; set window_seconds = 10;
+
+-- Preview rows to be changed (edit values in the CTE if needed)
+WITH vars AS (
+  SELECT 365::int AS lookback_days, 10::int AS window_seconds
+)
+SELECT id, item_key, course_id, stage, next_due_at, created_at
+FROM community.vocab_srs_item
+WHERE created_at >= now() - make_interval(days => (SELECT lookback_days FROM vars))
+  AND (
+    next_due_at = created_at
+    OR abs(EXTRACT(EPOCH FROM (next_due_at - created_at))) <= (SELECT window_seconds FROM vars)
+  )
+ORDER BY created_at ASC
+LIMIT 200;
+
+-- Conservative update: set next_due_at to next calendar day at 08:00
+WITH vars AS (
+  SELECT 365::int AS lookback_days, 10::int AS window_seconds
+)
+UPDATE community.vocab_srs_item
+SET next_due_at = date_trunc('day', created_at + interval '1 day') + interval '8 hours'
+WHERE created_at >= now() - make_interval(days => (SELECT lookback_days FROM vars))
+  AND (
+    next_due_at = created_at
+    OR abs(EXTRACT(EPOCH FROM (next_due_at - created_at))) <= (SELECT window_seconds FROM vars)
+  )
+RETURNING id, item_key, course_id, stage, next_due_at, created_at;
+
+-- After running, re-run `node backend/scripts/diag-srs-stats.js` to validate counts.