fix: optimize getRawSuggestions queries for member and organization (#4207)

Signed-off-by: Yeganathan S <63534555+skwowet@users.noreply.github.com>

Author: skwowet

backend/src/database/migrations/V1781455484__add-similarity-indexes-on-merge-raw-tables.sql

@@ -0,0 +1,7 @@
+-- Supports similarity range filtering used by
+-- getRawMemberSuggestions / getRawOrganizationSuggestions.
+create index concurrently if not exists "ix_memberToMergeRaw_similarity"
+  on "memberToMergeRaw" (similarity);
+
+create index concurrently if not exists "ix_organizationToMergeRaw_similarity"
+  on "organizationToMergeRaw" (similarity);

services/libs/data-access-layer/src/old/apps/merge_suggestions_worker/memberMergeSuggestions.repo.ts

@@ -316,7 +316,6 @@ class MemberMergeSuggestionsRepository {
                      )
                      ${similarityLTEFilter}
                      ${similarityGTEFilter}
-                     order by mtmr."memberId" desc
                      limit $(limit);`
 
     const results: IRawMemberMergeSuggestionResult[] = await this.connection.any(

services/libs/data-access-layer/src/old/apps/merge_suggestions_worker/organizationMergeSuggestions.repo.ts

@@ -293,7 +293,6 @@ class OrganizationMergeSuggestionsRepository {
 
                             )
                      )
-                     order by s."organizationId" desc
                      limit $(limit);`
     } else {
       query = `select * from "organizationToMergeRaw" otmr
@@ -314,7 +313,6 @@ class OrganizationMergeSuggestionsRepository {
                      )
                      ${similarityLTEFilter}
                      ${similarityGTEFilter}
-                     order by otmr."organizationId" desc
                      limit $(limit);`
     }