feat: prevent duplicate award pool notifications

Add notifiedAt field to AwardEligibility. notifyEligibleProjects now
skips already-notified entries and stamps notifiedAt after sending,
so re-clicking "Notify Pool" only emails newly added projects.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

prisma/migrations/20260303232956_add_award_eligibility_notified_at/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "AwardEligibility" ADD COLUMN     "notifiedAt" TIMESTAMP(3);

prisma/schema.prisma

@@ -1622,6 +1622,9 @@ model AwardEligibility {
   confirmedAt DateTime?
   confirmedBy String?
 
+  // Pool notification tracking
+  notifiedAt DateTime?
+
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 

src/server/routers/specialAward.ts

@@ -1269,9 +1269,9 @@ export const specialAwardRouter = router({
         select: { id: true, name: true, description: true, status: true },
       })
 
-      // Get eligible projects with submitter + team members
+      // Get eligible projects that haven't been notified yet
       const eligibilities = await ctx.prisma.awardEligibility.findMany({
-        where: { awardId: input.awardId, eligible: true },
+        where: { awardId: input.awardId, eligible: true, notifiedAt: null },
         select: {
           id: true,
           projectId: true,
@@ -1365,6 +1365,15 @@ export const specialAwardRouter = router({
         }
       }
 
+      // Stamp notifiedAt on all processed eligibilities to prevent re-notification
+      const notifiedIds = eligibilities.map((e) => e.id)
+      if (notifiedIds.length > 0) {
+        await ctx.prisma.awardEligibility.updateMany({
+          where: { id: { in: notifiedIds } },
+          data: { notifiedAt: new Date() },
+        })
+      }
+
       await logAudit({
         prisma: ctx.prisma,
         userId: ctx.user.id,