refactor: improve employment processing logic in CommonMemberService

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

Author: skwowet

services/libs/common_services/src/services/common.member.service.ts

@@ -209,18 +209,26 @@ export class CommonMemberService extends LoggerBase {
     // 3. Date matching: work history active at this timestamp
     const currentEmployments = await findMemberWorkExperience(this.qx, memberId, timestamp)
     if (currentEmployments.length > 0) {
-      const organizationIds = [...new Set(currentEmployments.map((row) => row.organizationId))]
-      const memberOrgDomains = await fetchManyOrganizationVerifiedPrimaryDomains(
-        this.qx,
-        organizationIds,
-      )
-
-      // Also applies when step 2 had a domain but no matching MO yet (e.g. ingest before stint inference).
-      const employments = preferCompanyOverUniversityWhenOverlapping(
-        currentEmployments,
-        memberOrgDomains,
-      )
-
+      let employments = currentEmployments
+    
+      if (employments.length > 1) {
+        const organizationIds = [
+          ...new Set(employments.map((row) => row.organizationId)),
+        ]
+    
+        const memberOrgDomains = await fetchManyOrganizationVerifiedPrimaryDomains(
+          this.qx,
+          organizationIds,
+        )
+    
+        // Also applies when step 2 found a domain but no matching member organization yet
+        // (e.g. ingest before stint inference).
+        employments = preferCompanyOverUniversityWhenOverlapping(
+          employments,
+          memberOrgDomains,
+        )
+      }
+    
       return this.decidePrimaryOrganizationId(employments)
     }