diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..c42bb87
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,53 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      checks: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+          cache-dependency-path: go.mod
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@v8
+        with:
+          version: v2.12.2
+          problem-matchers: true
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          cache: true
+          cache-dependency-path: go.mod
+
+      - name: Run unit tests
+        run: go test ./...
diff --git a/engine/storage/jsonl/decoder.go b/engine/storage/jsonl/decoder.go
index fb6c102..0cd118b 100644
--- a/engine/storage/jsonl/decoder.go
+++ b/engine/storage/jsonl/decoder.go
@@ -133,9 +133,9 @@ func (d *Decoder) decodeValue(name string, kind types.Kind, raw any) (types.Valu
 		}
 
 	case types.KindTimestamp:
-		return types.NewNullValue(), &types.TypeNotImplementedError{
-			Field: name,
-			Kind:  kind,
+		return types.NewNullValue(), &types.TypeError{
+			Field:    name,
+			Expected: kind,
 		}
 
 	default:
diff --git a/engine/types/error.go b/engine/types/error.go
index c9c5590..26f2ca1 100644
--- a/engine/types/error.go
+++ b/engine/types/error.go
@@ -14,13 +14,3 @@ func (e *TypeError) Error() string {
 
 	return "type error: field " + e.Field + " expected " + string(e.Expected) + " but got " + string(e.Actual)
 }
-
-// TypeNotImplementedError represents an error that occurs when a value's type is not implemented in the system.
-type TypeNotImplementedError struct {
-	Field string // The name of the field that caused the error
-	Kind  Kind   // The kind of the field that is not implemented
-}
-
-func (e *TypeNotImplementedError) Error() string {
-	return "type not implemented error: field " + e.Field + " of kind " + string(e.Kind) + " is not implemented"
-}