grpc endpoint showing database schema for the frontend, now working

proto/api.proto

@@ -14,8 +14,10 @@ service Adresar {
     rpc DeleteAdresar (DeleteAdresarRequest) returns (DeleteAdresarResponse);
     rpc GetAdresarCount (Empty) returns (CountResponse); // New endpoint
     rpc GetAdresarByPosition (PositionRequest) returns (AdresarResponse); // New endpoint
+    rpc GetTableStructure (Empty) returns (TableStructureResponse); // New endpoint for table structure
 }
 
+// Existing messages
 message GetAdresarRequest {
     int64 id = 1; // The ID of the Adresar entry to retrieve
 }
@@ -102,3 +104,15 @@ message CountResponse {
 message PositionRequest {
     int64 position = 1; // Request with the position of the item to retrieve
 }
+
+// New messages for the table structure endpoint
+message TableStructureResponse {
+    repeated TableColumn columns = 1; // List of columns in the table
+}
+
+message TableColumn {
+    string name = 1; // Name of the column
+    string data_type = 2; // Data type of the column (e.g., TEXT, INT, etc.)
+    bool is_nullable = 3; // Whether the column allows NULL values
+    bool is_primary_key = 4; // Whether the column is a primary key
+}