sqldb: use version-specific staleness checks in UpsertChannelPolicy

Update the UpsertChannelPolicy query to apply different staleness
checks based on gossip version. For v1 policies, continue checking
last_update timestamps. For v2 policies, check block_height instead,
using >= comparison to handle policies from the same block.

The version-specific WHERE clause ensures that policy updates are only
applied when they contain newer information according to the versioning
scheme appropriate for that gossip version.

sqldb/sqlc/graph.sql.go

@@ -3804,7 +3804,18 @@ ON CONFLICT (channel_id, node_id, version)
         signature = EXCLUDED.signature,
         block_height = EXCLUDED.block_height,
         disable_flags = EXCLUDED.disable_flags
-WHERE EXCLUDED.last_update > graph_channel_policies.last_update
+WHERE (
+    EXCLUDED.version = 1 AND (
+        graph_channel_policies.last_update IS NULL
+        OR EXCLUDED.last_update > graph_channel_policies.last_update
+    )
+)
+OR (
+    EXCLUDED.version = 2 AND (
+        graph_channel_policies.block_height IS NULL
+        OR EXCLUDED.block_height >= graph_channel_policies.block_height
+    )
+)
 RETURNING id
 `
 

sqldb/sqlc/queries/graph.sql

@@ -954,7 +954,18 @@ ON CONFLICT (channel_id, node_id, version)
         signature = EXCLUDED.signature,
         block_height = EXCLUDED.block_height,
         disable_flags = EXCLUDED.disable_flags
-WHERE EXCLUDED.last_update > graph_channel_policies.last_update
+WHERE (
+    EXCLUDED.version = 1 AND (
+        graph_channel_policies.last_update IS NULL
+        OR EXCLUDED.last_update > graph_channel_policies.last_update
+    )
+)
+OR (
+    EXCLUDED.version = 2 AND (
+        graph_channel_policies.block_height IS NULL
+        OR EXCLUDED.block_height >= graph_channel_policies.block_height
+    )
+)
 RETURNING id;
 
 -- name: GetChannelPolicyByChannelAndNode :one