Add a specific introspection test for CRDB 23.1

schema-engine/sql-introspection-tests/tests/simple/cockroach/foreign_keys_duplicates_should_be_ignored.sql

@@ -1,4 +1,5 @@
 -- tags=cockroachdb
+-- exclude=CockroachDB231
 
 CREATE TABLE "User" (
     id INT4 GENERATED BY DEFAULT AS IDENTITY,

schema-engine/sql-introspection-tests/tests/simple/cockroach/foreign_keys_duplicates_should_be_ignored_crdb23_1.sql

@@ -0,0 +1,40 @@
+-- tags=CockroachDB231
+
+CREATE TABLE "User" (
+    id INT4 GENERATED BY DEFAULT AS IDENTITY,
+    CONSTRAINT "User_pkey" PRIMARY KEY (id)
+);
+
+CREATE TABLE "Post" (
+    id INT4 GENERATED BY DEFAULT AS IDENTITY,
+    user_id INT4 REFERENCES "User"(id),
+    CONSTRAINT "Post_pkey" PRIMARY KEY (id)
+);
+
+ALTER TABLE "Post"
+    ADD CONSTRAINT "second_fk"
+        FOREIGN KEY (user_id)
+        REFERENCES "User"(id);
+
+
+/*
+generator js {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "cockroachdb"
+  url      = env("DATABASE_URL")
+}
+
+model Post {
+  id      Int   @id @default(sequence(maxValue: 2147483647))
+  user_id Int?
+  User    User? @relation(fields: [user_id], references: [id], onDelete: NoAction, onUpdate: NoAction)
+}
+
+model User {
+  id   Int    @id @default(sequence(maxValue: 2147483647))
+  Post Post[]
+}
+*/