Approve database migration

src/types/timeline.ts

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+/**
+ * Timeline Event Types
+ * 
+ * Type definitions for entity timeline/historical milestone system.
+ * All timeline events flow through moderation queue before being stored.
+ */
+
+export type TimelineEventType =
+  | 'name_change'
+  | 'operator_change'
+  | 'owner_change'
+  | 'location_change'
+  | 'status_change'
+  | 'closure'
+  | 'reopening'
+  | 'renovation'
+  | 'expansion'
+  | 'acquisition'
+  | 'milestone'
+  | 'other';
+
+export type EntityType = 'park' | 'ride' | 'company';
+
+export type DatePrecision = 'day' | 'month' | 'year';
+
+/**
+ * Timeline event stored in database after approval
+ */
+export interface TimelineEvent {
+  id: string;
+  entity_id: string;
+  entity_type: EntityType;
+  event_type: TimelineEventType;
+  event_date: string;
+  event_date_precision: DatePrecision;
+  title: string;
+  description?: string;
+  
+  // Type-specific relational data
+  from_value?: string;
+  to_value?: string;
+  from_entity_id?: string;
+  to_entity_id?: string;
+  from_location_id?: string;
+  to_location_id?: string;
+  
+  // Metadata
+  is_public: boolean;
+  display_order: number;
+  created_by?: string;
+  approved_by?: string;
+  submission_id?: string;
+  
+  created_at: string;
+  updated_at: string;
+}
+
+/**
+ * Form data for creating/editing timeline events
+ */
+export interface TimelineEventFormData {
+  event_type: TimelineEventType;
+  event_date: Date;
+  event_date_precision: DatePrecision;
+  title: string;
+  description?: string;
+  
+  // Conditional fields based on event_type
+  from_value?: string;
+  to_value?: string;
+  from_entity_id?: string;
+  to_entity_id?: string;
+  from_location_id?: string;
+  to_location_id?: string;
+  
+  is_public?: boolean;
+}
+
+/**
+ * Complete submission data for timeline events
+ * Includes entity reference and all form data
+ */
+export interface TimelineSubmissionData extends TimelineEventFormData {
+  entity_id: string;
+  entity_type: EntityType;
+}