diff --git a/packages/2-sql/1-core/contract/test/entity-kinds.test.ts b/packages/2-sql/1-core/contract/test/entity-kinds.test.ts
index 3fd6f4223194..a516f6094d75 100644
--- a/packages/2-sql/1-core/contract/test/entity-kinds.test.ts
+++ b/packages/2-sql/1-core/contract/test/entity-kinds.test.ts
@@ -1,8 +1,12 @@
 import { hydrateNamespaceEntities, UNBOUND_NAMESPACE_ID } from '@internal/framework-components/ir';
 import { describe, expect, it } from 'vitest';
 import { composeSqlEntityKinds, tableEntityKind, valueSetEntityKind } from '../src/entity-kinds';
+import { index } from '../src/factories';
+import { CheckConstraint } from '../src/ir/check-constraint';
 import { StorageTable } from '../src/ir/storage-table';
 import { StorageValueSet } from '../src/ir/storage-value-set';
+import type { SerializedCheckConstraint } from '../src/serialized-check-constraint';
+import type { SerializedIndex } from '../src/serialized-index';
 
 const emptyTableInput = {
   columns: {},
@@ -18,6 +22,67 @@ describe('tableEntityKind', () => {
     const result = tableEntityKind.construct(emptyTableInput);
     expect(result).toBeInstanceOf(StorageTable);
   });
+
+  describe('given stored records from contract.json', () => {
+    it('hydrates a stored index record into an Index node', () => {
+      const serialized: SerializedIndex = {
+        name: 'users_email_idx_ab12cd34',
+        prefix: 'users_email_idx',
+        columns: ['email'],
+        unique: true,
+      };
+      const result = tableEntityKind.construct({
+        ...emptyTableInput,
+        indexes: [serialized],
+      });
+      expect(result.indexes).toStrictEqual([
+        index('users_email_idx_ab12cd34', ['email'], { prefix: 'users_email_idx', unique: true }),
+      ]);
+    });
+
+    it('hydrates a stored check record into a CheckConstraint node', () => {
+      const serialized: SerializedCheckConstraint = {
+        name: 'users_email_check_ab12cd34',
+        prefix: 'users_email_check',
+        expression: "email <> ''",
+      };
+      const result = tableEntityKind.construct({
+        ...emptyTableInput,
+        checks: [serialized],
+      });
+      expect(result.checks).toStrictEqual([
+        new CheckConstraint({
+          naming: { kind: 'wire', prefix: 'users_email_check', hash: 'ab12cd34' },
+          expression: "email <> ''",
+        }),
+      ]);
+    });
+  });
+
+  describe('given IR nodes from authoring or an earlier hydration pass', () => {
+    it('keeps an existing Index node as the same instance', () => {
+      const idx = index('idx_users_email', ['email'], { unique: true });
+      const result = tableEntityKind.construct({
+        ...emptyTableInput,
+        indexes: [idx],
+      });
+      expect(result.indexes).toEqual([idx]);
+      expect(result.indexes[0]).toBe(idx);
+    });
+
+    it('keeps an existing CheckConstraint node as the same instance', () => {
+      const check = new CheckConstraint({
+        naming: { kind: 'exact', name: 'chk_users_age' },
+        expression: 'age >= 0',
+      });
+      const result = tableEntityKind.construct({
+        ...emptyTableInput,
+        checks: [check],
+      });
+      expect(result.checks).toEqual([check]);
+      expect(result.checks?.[0]).toBe(check);
+    });
+  });
 });
 
 describe('valueSetEntityKind', () => {