diff --git a/packages/2-sql/1-core/contract/test/storage-entry-schemas.test.ts b/packages/2-sql/1-core/contract/test/storage-entry-schemas.test.ts
new file mode 100644
index 000000000000..50e9d8d334b1
--- /dev/null
+++ b/packages/2-sql/1-core/contract/test/storage-entry-schemas.test.ts
@@ -0,0 +1,79 @@
+import { UNBOUND_NAMESPACE_ID } from '@internal/framework-components/ir';
+import { type } from 'arktype';
+import { describe, expect, it } from 'vitest';
+import { composeSqlEntityKinds } from '../src/entity-kinds';
+import { createSqlStorageSchema } from '../src/validators';
+
+describe('StorageColumnSchema — narrow validation', () => {
+  const storageSchema = createSqlStorageSchema(composeSqlEntityKinds());
+
+  function makeRawStorage(columnExtra: Record<string, unknown>) {
+    return {
+      storageHash: 'test',
+      namespaces: {
+        [UNBOUND_NAMESPACE_ID]: {
+          id: UNBOUND_NAMESPACE_ID,
+          entries: {
+            table: {
+              user: {
+                columns: {
+                  role: {
+                    nativeType: 'text',
+                    codecId: 'pg/text@1',
+                    nullable: false,
+                    ...columnExtra,
+                  },
+                },
+                uniques: [],
+                indexes: [],
+                foreignKeys: [],
+              },
+            },
+          },
+        },
+      },
+    };
+  }
+
+  it('accepts a column with only typeParams set', () => {
+    const result = storageSchema(makeRawStorage({ typeParams: { length: 255 } }));
+    expect(result).not.toBeInstanceOf(type.errors);
+  });
+
+  it('accepts a column with only typeRef set', () => {
+    const result = storageSchema(makeRawStorage({ typeRef: 'MyType' }));
+    expect(result).not.toBeInstanceOf(type.errors);
+  });
+
+  it('rejects a column with both typeParams and typeRef set', () => {
+    const result = storageSchema(
+      makeRawStorage({ typeParams: { length: 255 }, typeRef: 'MyType' }),
+    );
+    expect(result).toBeInstanceOf(type.errors);
+  });
+
+  it('rejects a column with an empty noCheck array', () => {
+    const result = storageSchema(makeRawStorage({ noCheck: [] }));
+    expect(result).toBeInstanceOf(type.errors);
+  });
+
+  it('accepts a column with a single-element noCheck array', () => {
+    const result = storageSchema(makeRawStorage({ noCheck: ['membership'] }));
+    expect(result).not.toBeInstanceOf(type.errors);
+  });
+
+  it('accepts a column with sorted, unique noCheck kinds', () => {
+    const result = storageSchema(makeRawStorage({ noCheck: ['elementNotNull', 'membership'] }));
+    expect(result).not.toBeInstanceOf(type.errors);
+  });
+
+  it('rejects a column with unsorted noCheck kinds', () => {
+    const result = storageSchema(makeRawStorage({ noCheck: ['membership', 'elementNotNull'] }));
+    expect(result).toBeInstanceOf(type.errors);
+  });
+
+  it('rejects a column with duplicate noCheck kinds', () => {
+    const result = storageSchema(makeRawStorage({ noCheck: ['membership', 'membership'] }));
+    expect(result).toBeInstanceOf(type.errors);
+  });
+});