Final completeness by time window: ranges keep their posting span, release_final() over blocks of done ranges

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/services/range_blocks.ts

@@ -0,0 +1,31 @@
+import db from '@adonisjs/lucid/services/db'
+
+/**
+ * range_blocks (migration 3900): per group, each run of consecutive done ranges with its posting time span, read by
+ * release_final(). A few thousand rows from ~650k ranges, rebuilt whole in one statement each time; a run breaks at a
+ * range that isn't done or doesn't start where the one before ended.
+ */
+class RangeBlocks {
+  async rebuild(): Promise<number> {
+    return db.transaction(async (trx) => {
+      await trx.rawQuery(`DELETE FROM range_blocks`)
+      const result = await trx.rawQuery(
+        `WITH r AS (
+           SELECT group_id, start_id, end_id, status = 'done' AS done, posted_low, posted_high,
+                  min(start_id) OVER (PARTITION BY group_id) AS group_first,
+                  lag(status = 'done') OVER w AS done_before, lag(end_id) OVER w AS end_before
+           FROM ranges WINDOW w AS (PARTITION BY group_id ORDER BY start_id)),
+         runs AS (
+           SELECT *, sum(CASE WHEN done IS DISTINCT FROM done_before OR end_before IS DISTINCT FROM start_id - 1 THEN 1 ELSE 0 END)
+                       OVER (PARTITION BY group_id ORDER BY start_id) AS run
+           FROM r)
+         INSERT INTO range_blocks (group_id, start_id, end_id, posted_low, posted_high, at_group_start)
+         SELECT group_id, min(start_id), max(end_id), min(posted_low), max(posted_high), min(start_id) = min(group_first)
+         FROM runs WHERE done GROUP BY group_id, run`
+      )
+      return result.rowCount ?? 0
+    })
+  }
+}
+
+export default new RangeBlocks()