feat(constraints): Add PRIMARY KEY constraint support and enhance column management tests

- Add PRIMARY KEY to constraint types in features.json
- Update constraints API to handle PRIMARY KEY operations
- Add PRIMARY KEY to constraint listing query
- Add validation and tests for PRIMARY KEY constraints
- Add tests for DEFAULT value and NOT NULL in column management
- Update ROADMAP.md to mark PRIMARY KEY, DEFAULT, and NOT NULL as complete
- Update README.md with new constraint capabilities
- Update TESTING.md with comprehensive test coverage (105 total tests)

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

src/app/api/admin/constraints/route.ts

@@ -69,7 +69,7 @@ export async function GET(request: Request) {
         ON tc.constraint_name = cc.constraint_name
       WHERE tc.table_schema = 'public'
         AND tc.table_name = ${tableName}
-        AND tc.constraint_type IN ('UNIQUE', 'CHECK')
+        AND tc.constraint_type IN ('PRIMARY KEY', 'UNIQUE', 'CHECK')
       ORDER BY tc.constraint_name
     `);
 
@@ -133,7 +133,15 @@ export async function POST(request: Request) {
 
     let alterQuery = '';
 
-    if (constraintType === 'UNIQUE') {
+    if (constraintType === 'PRIMARY KEY') {
+      if (!columnName) {
+        return NextResponse.json(
+          { error: 'Column name is required for PRIMARY KEY constraint' },
+          { status: 400 },
+        );
+      }
+      alterQuery = `ALTER TABLE "${tableName}" ADD CONSTRAINT "${constraintName}" PRIMARY KEY ("${columnName}")`;
+    } else if (constraintType === 'UNIQUE') {
       if (!columnName) {
         return NextResponse.json(
           { error: 'Column name is required for UNIQUE constraint' },
@@ -170,7 +178,7 @@ export async function POST(request: Request) {
       alterQuery = `ALTER TABLE "${tableName}" ADD CONSTRAINT "${constraintName}" CHECK (${checkExpression})`;
     } else {
       return NextResponse.json(
-        { error: 'Unsupported constraint type. Supported types: UNIQUE, CHECK' },
+        { error: 'Unsupported constraint type. Supported types: PRIMARY KEY, UNIQUE, CHECK' },
         { status: 400 },
       );
     }

src/config/features.json

@@ -107,6 +107,12 @@
     }
   ],
   "constraintTypes": [
+    {
+      "name": "PRIMARY KEY",
+      "description": "Unique identifier for table rows",
+      "requiresColumn": true,
+      "requiresExpression": false
+    },
     {
       "name": "UNIQUE",
       "description": "Ensure column values are unique",

src/utils/featureConfig.test.ts

@@ -280,6 +280,15 @@ describe('FeatureConfig', () => {
       });
     });
 
+    it('should include PRIMARY KEY constraint type', () => {
+      const constraintTypes = getConstraintTypes();
+      const primaryKeyConstraint = constraintTypes.find(ct => ct.name === 'PRIMARY KEY');
+      
+      expect(primaryKeyConstraint).toBeDefined();
+      expect(primaryKeyConstraint?.requiresColumn).toBe(true);
+      expect(primaryKeyConstraint?.requiresExpression).toBe(false);
+    });
+
     it('should include UNIQUE constraint type', () => {
       const constraintTypes = getConstraintTypes();
       const uniqueConstraint = constraintTypes.find(ct => ct.name === 'UNIQUE');