diff --git a/backend/services/mpc-service/Dockerfile b/backend/services/mpc-service/Dockerfile
index bb4928ee..40554715 100644
--- a/backend/services/mpc-service/Dockerfile
+++ b/backend/services/mpc-service/Dockerfile
@@ -17,7 +17,7 @@ COPY prisma ./prisma/
 RUN npm ci
 
 # Generate Prisma client (dummy DATABASE_URL for build time only)
-RUN DATABASE_URL="mysql://user:pass@localhost:3306/db" npx prisma generate
+RUN DATABASE_URL="postgresql://user:pass@localhost:5432/db" npx prisma generate
 
 # Copy source code
 COPY src ./src
@@ -44,7 +44,7 @@ RUN npm ci --only=production
 
 # Copy Prisma schema and generate client (dummy DATABASE_URL for build time only)
 COPY prisma ./prisma/
-RUN DATABASE_URL="mysql://user:pass@localhost:3306/db" npx prisma generate
+RUN DATABASE_URL="postgresql://user:pass@localhost:5432/db" npx prisma generate
 
 # Copy built files
 COPY --from=builder /app/dist ./dist
diff --git a/backend/services/mpc-service/prisma/schema.prisma b/backend/services/mpc-service/prisma/schema.prisma
index fb6a36a6..49b2d222 100644
--- a/backend/services/mpc-service/prisma/schema.prisma
+++ b/backend/services/mpc-service/prisma/schema.prisma
@@ -29,9 +29,9 @@ model PartyShare {
   lastUsedAt  DateTime? @map("last_used_at")
 
   @@unique([partyId, sessionId], name: "uk_party_session")
-  @@index([partyId], name: "idx_party_id")
-  @@index([sessionId], name: "idx_session_id")
-  @@index([status], name: "idx_status")
+  @@index([partyId], name: "idx_ps_party_id")
+  @@index([sessionId], name: "idx_ps_session_id")
+  @@index([status], name: "idx_ps_status")
   @@map("party_shares")
 }
 
@@ -57,9 +57,9 @@ model SessionState {
   completedAt  DateTime? @map("completed_at")
 
   @@unique([sessionId, partyId], name: "uk_session_party")
-  @@index([sessionId], name: "idx_session_id")
-  @@index([partyId], name: "idx_party_id")
-  @@index([status], name: "idx_status")
+  @@index([sessionId], name: "idx_ss_session_id")
+  @@index([partyId], name: "idx_ss_party_id")
+  @@index([status], name: "idx_ss_status")
   @@map("session_states")
 }