Upgrade PostgreSQL to 15

.github/workflows/ci.yaml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     services:
       postgres:
-        image: postgres:12
+        image: postgres:15
         env:
           POSTGRES_PASSWORD: postgres
           POSTGRES_HOST_AUTH_METHOD: trust
@@ -50,15 +50,15 @@ jobs:
         env:
           CTMS_DB_URL: postgresql://postgres:postgres@172.17.0.1:5432/postgres # pragma: allowlist secret
           CTMS_SECRET_KEY: secret_${{ github.sha }} # pragma: allowlist secret
-  
+
   build_production_image:
     runs-on: ubuntu-latest
     steps:
 
       - name: Checkout code
         uses: actions/checkout@v4
 
-      - name: Build production image 
+      - name: Build production image
         uses: docker/build-push-action@v6
         with:
           context: .

ctms/crud.py

@@ -59,12 +59,18 @@ def count_total_contacts(db: Session) -> int:
     This metadata is refreshed on `VACUUM` or `ANALYSIS` which
     is run regularly by default on our database instances.
     """
-    query = text(
-        "SELECT reltuples AS estimate "
-        "FROM pg_class "
-        f"where relname = '{Email.__tablename__}'"
-    )
-    result = db.execute(query).scalar()
+    result = db.execute(
+        text(
+            "SELECT reltuples AS estimate "
+            "FROM pg_class "
+            f"where relname = '{Email.__tablename__}'"
+        )
+    ).scalar()
+    if result is None or result < 0:
+        # Fall back to a full count if the estimate is not available.
+        result = db.execute(
+            text(f"SELECT COUNT(*) FROM {Email.__tablename__}")
+        ).scalar()
     if result is None:
         return -1
     return int(result)

docker-compose.yaml

@@ -22,7 +22,7 @@ services:
       timeout: 1s
       retries: 10
   postgres:
-    image: postgres:12
+    image: postgres:15
     ports:
       - 5432:5432
     environment: