Diagnóstico y fix SQL Server: SERVERNAME, TDS_Version, Puerto explicitos

backend/data_manager.py

@@ -44,10 +44,22 @@ class DataManager:
 
     def sql_conn(self):
         import pyodbc
-        conn_str = (
-            f"DRIVER={self.sql_driver};SERVER={self.sql_server};"
-            f"DATABASE={self.sql_db};UID={self.sql_user};PWD={self.sql_pass}"
-        )
+        if "FreeTDS" in self.sql_driver:
+            conn_str = (
+                f"DRIVER={self.sql_driver};"
+                f"SERVER={self.sql_server};"
+                f"PORT=1433;"
+                f"DATABASE={self.sql_db};"
+                f"UID={self.sql_user};"
+                f"PWD={self.sql_pass};"
+                f"TDS_Version=7.3;"
+                f"ClientCharset=UTF-8;"
+            )
+        else:
+            conn_str = (
+                f"DRIVER={self.sql_driver};SERVER={self.sql_server};"
+                f"DATABASE={self.sql_db};UID={self.sql_user};PWD={self.sql_pass}"
+            )
         return pyodbc.connect(conn_str)
 
     # ── Config de campañas (GitHub, opcional) ───────────────────