update error messages:

packages/server/src/integrations/base/errorMapping.ts

@@ -5,9 +5,20 @@ const mysqlErrorMessages: Record<number, string> = {
   1049: "The specified database does not exist. Please verify that the database name is correct.",
 }
 
-const postgresErrorMessages: Record<number, string> = {}
+const postgresErrorMessages: Record<string, string> = {
+  "23505": "Duplicate key value violates unique constraint.",
+  "23502": "Null value not allowed for a column.",
+  "23503": "Foreign key violation.",
+  "23514": "Check constraint violation.",
+  "42703": "Undefined column.",
+  "42P01": "Undefined table.",
+}
 
-const sqlServerErrorMessages: Record<number, string> = {}
+const sqlServerErrorMessages: Record<number, string> = {
+  547: "The INSERT statement conflicted with the FOREIGN KEY constraint.",
+  2601: "Cannot insert duplicate key row in object.",
+  515: "Cannot insert the value NULL into column.",
+}
 
 export const getReadableErrorMessage = (type: string, errno: number) => {
   switch (type) {

packages/server/src/integrations/microsoftSqlServer.ts

@@ -182,7 +182,7 @@ class SqlServerIntegration extends Sql implements DatasourcePlus {
     } catch (err: any) {
       let readableMessage = getReadableErrorMessage(
         SourceName.SQL_SERVER,
-        err.errno
+        err.number
       )
       if (readableMessage) {
         throw new Error(readableMessage)

packages/server/src/integrations/postgres.ts

@@ -247,7 +247,7 @@ class PostgresIntegration extends Sql implements DatasourcePlus {
       await this.closeConnection()
       let readableMessage = getReadableErrorMessage(
         SourceName.POSTGRES,
-        err.errno
+        err.code
       )
       if (readableMessage) {
         throw new Error(readableMessage)