Remove some unused fields, fix a broken spec.

packages/server/src/api/routes/tests/datasource.spec.ts

@@ -37,7 +37,7 @@ describe("/datasources", () => {
         .expect(200)
 
       expect(res.body.datasource.name).toEqual("Test")
-      expect(res.body.errors).toBeUndefined()
+      expect(res.body.errors).toEqual({})
       expect(events.datasource.created).toBeCalledTimes(1)
     })
   })

packages/server/src/integrations/microsoftSqlServer.ts

@@ -192,8 +192,6 @@ class SqlServerIntegration extends Sql implements DatasourcePlus {
   private readonly config: MSSQLConfig
   private index: number = 0
   private client?: sqlServer.ConnectionPool
-  public tables: Record<string, ExternalTable> = {}
-  public schemaErrors: Record<string, string> = {}
 
   MASTER_TABLES = [
     "spt_fallback_db",

packages/server/src/integrations/oracle.ts

@@ -110,9 +110,6 @@ class OracleIntegration extends Sql implements DatasourcePlus {
   private readonly config: OracleConfig
   private index: number = 1
 
-  public tables: Record<string, ExternalTable> = {}
-  public schemaErrors: Record<string, string> = {}
-
   private readonly COLUMNS_SQL = `
     SELECT
       tabs.table_name,