diff --git a/backend/scripts/fix-srs-immediate-due.js b/backend/scripts/fix-srs-immediate-due.js
index f735f65..e3f8c7f 100644
--- a/backend/scripts/fix-srs-immediate-due.js
+++ b/backend/scripts/fix-srs-immediate-due.js
@@ -10,20 +10,25 @@ import { sequelize } from '../utils/sequelize.js';
  */
 
 const DRY_RUN = process.env.DRY_RUN !== 'false';
+const LOOKBACK_DAYS = parseInt(process.env.LOOKBACK_DAYS || '365', 10);
+const WINDOW_SECONDS = parseInt(process.env.WINDOW_SECONDS || '10', 10);
 
 const run = async () => {
   try {
     await sequelize.authenticate();
     console.log('✅ DB connection OK');
 
-    // Conservative selector: items created in the last 3 days where next_due_at is within 2 minutes of created_at
+    // Selector: items created in the last LOOKBACK_DAYS where next_due_at is within WINDOW_SECONDS of created_at
     const selector = `
       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() - interval '${LOOKBACK_DAYS} 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 500
+      LIMIT 1000
     `;
 
     const recent = await sequelize.query(selector, { type: sequelize.QueryTypes.SELECT });
@@ -31,7 +36,7 @@ const run = async () => {
     console.table(recent.slice(0, 20));
 
     if (recent.length === 0) {
-      console.log('\nNo candidate rows found — nothing to do.');
+      console.log(`\nNo candidate rows found for lookback ${LOOKBACK_DAYS} days and window ${WINDOW_SECONDS}s — nothing to do.`);
       return;
     }
 
@@ -40,8 +45,11 @@ const run = async () => {
     const updateQuery = `
       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() - interval '${LOOKBACK_DAYS} 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;
     `;
 
diff --git a/backend/scripts/fix-srs-queries-plain.sql b/backend/scripts/fix-srs-queries-plain.sql
new file mode 100644
index 0000000..ab9a968
--- /dev/null
+++ b/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.
diff --git a/backend/scripts/fix-srs-queries.sql b/backend/scripts/fix-srs-queries.sql
index d1ce4bc..01baa3a 100644
--- a/backend/scripts/fix-srs-queries.sql
+++ b/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.