Support event type filtering.

src/lib/constants.ts

@@ -71,6 +71,7 @@ export const FILTER_COLUMNS = {
   language: 'language',
   event: 'event_name',
   tag: 'tag',
+  eventType: 'event_type',
 };
 
 export const COLLECTION_TYPE = {

src/lib/schema.ts

@@ -37,6 +37,7 @@ export const filterParams = {
   event: z.string().optional(),
   segment: z.string().optional(),
   cohort: z.string().optional(),
+  eventType: z.coerce.number().int().positive().optional(),
 };
 
 export const searchParams = {