diff --git a/web/src/lib/types.ts b/web/src/lib/types.ts
new file mode 100644
index 0000000..7ca36c4
--- /dev/null
+++ b/web/src/lib/types.ts
@@ -0,0 +1,103 @@
+export interface Ticket {
+  id: string;
+  subject: string;
+  queue_id: string;
+  status: string;
+  owner_id: string | null;
+  creator_id: string;
+  created_at: string;
+  updated_at: string;
+  started_at: string | null;
+  resolved_at: string | null;
+  custom_fields?: CustomFieldValue[];
+}
+
+export interface Queue {
+  id: string;
+  name: string;
+  description: string | null;
+  lifecycle_id: string | null;
+}
+
+export interface Transaction {
+  id: string;
+  ticket_id: string;
+  transaction_type: string;
+  field: string | null;
+  old_value: string | null;
+  new_value: string | null;
+  data: unknown;
+  creator_id: string;
+  created_at: string;
+}
+
+export interface Scrip {
+  id: string;
+  queue_id: string | null;
+  name: string;
+  condition_type: string;
+  action_type: string;
+  action_config: Record<string, unknown>;
+  template_id: string | null;
+  stage: string;
+  sort_order: number;
+  disabled: boolean;
+}
+
+export interface Template {
+  id: string;
+  name: string;
+  queue_id: string | null;
+  subject_template: string;
+  body_template: string;
+}
+
+export interface Lifecycle {
+  id: string;
+  name: string;
+  definition: LifecycleDefinition;
+}
+
+export interface LifecycleDefinition {
+  statuses: { initial: string[]; active: string[]; inactive: string[] };
+  transitions: Record<string, string[]>;
+}
+
+export interface CustomField {
+  id: string;
+  name: string;
+  field_type: string;
+  values: unknown | null;
+  max_values: number;
+}
+
+export interface CustomFieldValue {
+  id: string;
+  custom_field_id: string;
+  ticket_id: string;
+  value: string;
+  custom_field?: CustomField;
+}
+
+export interface PreviewResult {
+  prepared_scrips: PreparedScrip[];
+}
+
+export interface PreparedScrip {
+  scripId: string;
+  scripName: string;
+  actionType: string;
+  actionPayload: unknown;
+  dryRun: boolean;
+}
+
+export interface UpdateResult {
+  ticket: Ticket;
+  scrip_results: ScripResult[];
+}
+
+export interface ScripResult {
+  scripId: string;
+  success: boolean;
+  message: string;
+}