refactoring search based on the profile

common/proto/search.proto

@@ -7,14 +7,16 @@ service Searcher {
 }
 
 message SearchRequest {
-  string table_name = 1;
+  optional string table_name = 1;
   string query = 2;
+  string profile_name = 3;
 }
 message SearchResponse {
   message Hit {
     int64 id = 1; // PostgreSQL row ID
     float score = 2;
     string content_json = 3;
+    string table_name = 4;
   }
   repeated Hit hits = 1;
 }