storcon/diesel: add leader table

storage_controller/migrations/2024-07-26-140924_create_leader/down.sql

@@ -0,0 +1 @@
+DROP TABLE leader;

storage_controller/migrations/2024-07-26-140924_create_leader/up.sql

@@ -0,0 +1,6 @@
+CREATE TABLE leader (
+  hostname VARCHAR NOT NULL,
+  port INTEGER NOT NULL,
+  started_at TIMESTAMPTZ NOT NULL,
+  PRIMARY KEY(hostname, port, started_at)
+);

storage_controller/src/schema.rs

@@ -1,5 +1,13 @@
 // @generated automatically by Diesel CLI.
 
+diesel::table! {
+    leader (hostname, port, started_at) {
+        hostname -> Varchar,
+        port -> Int4,
+        started_at -> Timestamptz,
+    }
+}
+
 diesel::table! {
     metadata_health (tenant_id, shard_number, shard_count) {
         tenant_id -> Varchar,
@@ -36,4 +44,4 @@ diesel::table! {
     }
 }
 
-diesel::allow_tables_to_appear_in_same_query!(metadata_health, nodes, tenant_shards,);
+diesel::allow_tables_to_appear_in_same_query!(leader, metadata_health, nodes, tenant_shards,);