feat: OLAP status priority functions and query updates (#3156)

* feat: OLAP status priority functions and query updates

- Add v1_status_priority / v1_status_from_priority for v1_readable_status_olap
- Use priority-based aggregation in OLAP task status update queries (EVICTED
  below terminal statuses)
- Migration v1_0_84 and schema v1-olap.sql

Made-with: Cursor

* test: durable eviction tests — replay, cancel after eviction, restore idempotency

- test_eviction_plus_replay, test_evictable_cancel_after_eviction, test_restore_idempotency
- Tighter poll interval for faster test runs

Made-with: Cursor

* fix: flakes

* feedback

sql/schema/v1-olap.sql

@@ -9,6 +9,33 @@ CREATE TYPE v1_readable_status_olap AS ENUM (
     'EVICTED'
 );
 
+-- NOTE: enum ordering puts EVICTED after COMPLETED, but logically EVICTED is
+-- non-terminal and should rank below terminal statuses. These functions provide
+-- the canonical priority ordering for aggregation and comparison.
+CREATE OR REPLACE FUNCTION v1_status_to_priority(s v1_readable_status_olap)
+RETURNS int IMMUTABLE LANGUAGE sql AS $$
+    SELECT CASE s
+        WHEN 'QUEUED'    THEN 1
+        WHEN 'RUNNING'   THEN 2
+        WHEN 'EVICTED'   THEN 3
+        WHEN 'CANCELLED' THEN 4
+        WHEN 'FAILED'    THEN 5
+        WHEN 'COMPLETED' THEN 6
+    END;
+$$;
+
+CREATE OR REPLACE FUNCTION v1_status_from_priority(p int)
+RETURNS v1_readable_status_olap IMMUTABLE LANGUAGE sql AS $$
+    SELECT CASE p
+        WHEN 1 THEN 'QUEUED'
+        WHEN 2 THEN 'RUNNING'
+        WHEN 3 THEN 'EVICTED'
+        WHEN 4 THEN 'CANCELLED'
+        WHEN 5 THEN 'FAILED'
+        WHEN 6 THEN 'COMPLETED'
+    END::v1_readable_status_olap;
+$$;
+
 -- HELPER FUNCTIONS FOR PARTITIONED TABLES --
 CREATE OR REPLACE FUNCTION get_v1_partitions_before_date(
     targetTableName text,