Initial project snapshot

backend/migrations/000019_mesh_latest_link_observation_key.down.sql

@@ -0,0 +1,23 @@
+WITH ranked AS (
+    SELECT ctid,
+           ROW_NUMBER() OVER (
+               PARTITION BY cluster_id, source_node_id, target_node_id
+               ORDER BY observed_at DESC
+           ) AS rn
+    FROM mesh_latest_links
+)
+DELETE FROM mesh_latest_links
+USING ranked
+WHERE mesh_latest_links.ctid = ranked.ctid
+  AND ranked.rn > 1;
+
+DROP INDEX IF EXISTS idx_mesh_latest_links_cluster_observed;
+
+ALTER TABLE mesh_latest_links
+    DROP CONSTRAINT IF EXISTS mesh_latest_links_pkey;
+
+ALTER TABLE mesh_latest_links
+    ADD PRIMARY KEY (cluster_id, source_node_id, target_node_id);
+
+ALTER TABLE mesh_latest_links
+    DROP COLUMN IF EXISTS observation_key;