refactor(queries): replace hardcoded event types with constants

Replaced hardcoded `event_type` values with named constants from
`EVENT_TYPE`, as in #3614. Added the `BOUNCE_THRESHOLD` constant and
documented it in `docker-compose.yml`.

src/queries/sql/events/getWebsiteEvents.ts

@@ -22,8 +22,8 @@ async function relationalQuery(websiteId: string, filters: QueryFilters) {
   });
 
   const searchQuery = search
-    ? `and ((event_name ilike {{search}} and event_type = 2)
-           or (url_path ilike {{search}} and event_type = 1))`
+    ? `and ((event_name ilike {{search}} and event_type = ${EVENT_TYPE.customEvent})
+           or (url_path ilike {{search}} and event_type = ${EVENT_TYPE.pageView}))`
     : '';
 
   return pagedRawQuery(
@@ -77,8 +77,8 @@ async function clickhouseQuery(websiteId: string, filters: QueryFilters) {
   });
 
   const searchQuery = search
-    ? `and ((positionCaseInsensitive(event_name, {search:String}) > 0 and event_type = 2)
-           or (positionCaseInsensitive(url_path, {search:String}) > 0 and event_type = 1))`
+    ? `and ((positionCaseInsensitive(event_name, {search:String}) > 0 and event_type = ${EVENT_TYPE.customEvent})
+           or (positionCaseInsensitive(url_path, {search:String}) > 0 and event_type = ${EVENT_TYPE.pageView}))`
     : '';
 
   return pagedRawQuery(

src/queries/sql/sessions/getWebsiteSession.ts

@@ -49,8 +49,8 @@ async function relationalQuery(websiteId: string, sessionId: string) {
           session.city,
           min(website_event.created_at) as min_time,
           max(website_event.created_at) as max_time,
-          sum(case when website_event.event_type = 1 then 1 else 0 end) as views,
-          sum(case when website_event.event_type = 2 then 1 else 0 end) as events
+          sum(case when website_event.event_type = ${EVENT_TYPE.pageView} then 1 else 0 end) as views,
+          sum(case when website_event.event_type = ${EVENT_TYPE.customEvent} then 1 else 0 end) as events
     from session
     join website_event on website_event.session_id = session.session_id
     where session.website_id = {{websiteId::uuid}}

src/queries/sql/sessions/getWebsiteSessionStats.ts

@@ -36,11 +36,11 @@ async function relationalQuery(
   return rawQuery(
     `
     select
-      sum(case when website_event.event_type = 1 then 1 else 0 end) as "pageviews",
+      sum(case when website_event.event_type = ${EVENT_TYPE.pageView} then 1 else 0 end) as "pageviews",
       count(distinct website_event.session_id) as "visitors",
       count(distinct website_event.visit_id) as "visits",
       count(distinct session.country) as "countries",
-      sum(case when website_event.event_type = 2 then 1 else 0 end) as "events"
+      sum(case when website_event.event_type = ${EVENT_TYPE.customEvent} then 1 else 0 end) as "events"
     from website_event
     ${cohortQuery}
     join session on website_event.session_id = session.session_id
@@ -67,11 +67,11 @@ async function clickhouseQuery(
   if (EVENT_COLUMNS.some(item => Object.keys(filters).includes(item))) {
     sql = `
     select
-      sumIf(1, event_type = 1) as "pageviews",
+      sumIf(1, event_type = ${EVENT_TYPE.pageView}) as "pageviews",
       uniq(session_id) as "visitors",
       uniq(visit_id) as "visits",
       uniq(country) as "countries",
-      sumIf(1, event_type = 2) as "events"
+      sumIf(1, event_type = ${EVENT_TYPE.customEvent}) as "events"
     from website_event
     ${cohortQuery}
     where website_id = {websiteId:UUID}

src/queries/sql/sessions/getWebsiteSessions.ts

@@ -50,8 +50,8 @@ async function relationalQuery(websiteId: string, filters: QueryFilters) {
       min(website_event.created_at) as "firstAt",
       max(website_event.created_at) as "lastAt",
       count(distinct website_event.visit_id) as "visits",
-      sum(case when website_event.event_type = 1 then 1 else 0 end) as "views",
-      sum(case when website_event.event_type = 2 then 1 else 0 end) as "events",
+      sum(case when website_event.event_type = ${EVENT_TYPE.pageView} then 1 else 0 end) as "views",
+      sum(case when website_event.event_type = ${EVENT_TYPE.customEvent} then 1 else 0 end) as "events",
       max(website_event.created_at) as "createdAt"
     from website_event 
     ${cohortQuery}
@@ -125,8 +125,8 @@ async function clickhouseQuery(websiteId: string, filters: QueryFilters) {
       ${getDateStringSQL('min(created_at)')} as firstAt,
       ${getDateStringSQL('max(created_at)')} as lastAt,
       uniq(visit_id) as visits,
-      sumIf(1, event_type = 1) as views,
-      sumIf(1, event_type = 2) as events,
+      sumIf(1, event_type = ${EVENT_TYPE.pageView}) as views,
+      sumIf(1, event_type = ${EVENT_TYPE.customEvent}) as events,
       max(created_at) as createdAt
     from website_event
     ${cohortQuery}
@@ -155,7 +155,7 @@ async function clickhouseQuery(websiteId: string, filters: QueryFilters) {
       ${getDateStringSQL('min(min_time)')} as firstAt,
       ${getDateStringSQL('max(max_time)')} as lastAt,
       uniq(visit_id) as visits,
-      sumIf(views, event_type = 1) as views,
+      sumIf(views, event_type = ${EVENT_TYPE.pageView}) as views,
       sum(length(event_name)) as events,
       max(max_time) as createdAt
     from website_event_stats_hourly as website_event