Merge pull request #51 from adela-bytebase/adela-bytebase-patch-47

Modify username column to allow NULL values

Author: adela-bytebase

migrations-semver/1.0.1_create_t1.sql

@@ -0,0 +1,4 @@
+CREATE TABLE "public"."t1" (
+    "id" serial PRIMARY KEY,
+    "username" text  NOT NULL
+);