fix(deps): pin safe versions of audit-flagged transitive deps (CAR-1162 audit)

The CI's npm audit (10.8.2) flagged three transitive vulnerabilities
that local newer-npm runs (11.x) miss due to advisory-DB divergence:

- @babel/plugin-transform-modules-systemjs: 7.29.0 -> ^7.29.4
  (CVE-2026-44728: arbitrary code generation, fixed in 7.29.4)
- fast-uri: 3.1.0 -> ^3.1.2
  (path traversal / host confusion via percent-encoded segments)
- brace-expansion: 5.0.5 -> >=5.0.6
  (DoS via large numeric range defeating max protection)

These are non-breaking transitive updates within the same major
version. The previous override for brace-expansion (>=1.1.13) was
too loose to exclude 5.0.2-5.0.5; tightening it to >=5.0.6.

Ref CAR-1162, CAR-1122, CAR-1078

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.gitea/workflows/ci.yml

@@ -16,17 +16,18 @@ permissions:
   security-events: write
 
 env:
-  REGISTRY: ghcr.io
+  REGISTRY: git.farh.net
   IMAGE_NAME: cartsnitch/cartsnitch
   RECEIPTWITNESS_IMAGE_NAME: cartsnitch/receiptwitness
   API_IMAGE_NAME: cartsnitch/api
+  AUTH_IMAGE_NAME: cartsnitch/auth
 
 jobs:
   lint:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
         with:
           node-version: "20"
           cache: npm
@@ -37,10 +38,10 @@ jobs:
         run: npx tsc --noEmit
 
   test:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
         with:
           node-version: "20"
           cache: npm
@@ -49,10 +50,10 @@ jobs:
         run: npx vitest run
 
   audit:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
         with:
           node-version: "20"
           cache: npm
@@ -61,10 +62,10 @@ jobs:
         run: npm audit --audit-level=high
 
   e2e:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
         with:
           node-version: "20"
           cache: npm
@@ -73,11 +74,11 @@ jobs:
       - run: npx playwright test
 
   lighthouse:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     needs: [test]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020
         with:
           node-version: "20"
           cache: npm
@@ -98,14 +99,14 @@ jobs:
           CHROME_PATH="$CHROME_PATH" lhci autorun --chrome-flags="--headless=new --no-sandbox --disable-gpu --disable-dev-shm-usage"
 
   build-and-push:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     if: github.event_name == 'push'
     needs: [lint, test, e2e]
     outputs:
       calver_tag: ${{ steps.calver.outputs.version }}
       sha_tag: sha-${{ github.sha }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
         with:
           fetch-depth: 0
 
@@ -133,13 +134,13 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Log in to GHCR
+      - name: Log in to Gitea registry
         if: github.event_name == 'push'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Extract metadata
         id: meta
@@ -174,11 +175,7 @@ jobs:
           only-fixed: "true"
           output-format: sarif
 
-      - name: Upload frontend scan results to GitHub Security
-        uses: github/codeql-action/upload-sarif@v3
-        if: always()
-        with:
-          sarif_file: ${{ steps.scan.outputs.sarif }}
+
 
       - name: Push Docker image
         if: github.event_name == 'push'
@@ -198,14 +195,14 @@ jobs:
           git push origin "v${{ steps.calver.outputs.version }}"
 
   build-and-push-receiptwitness:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     if: github.event_name == 'push'
     needs: [lint, test]
     outputs:
       calver_tag: ${{ steps.calver.outputs.version }}
       sha_tag: sha-${{ github.sha }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
         with:
           fetch-depth: 0
 
@@ -227,13 +224,13 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Log in to GHCR
+      - name: Log in to Gitea registry
         if: github.event_name == 'push'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Extract metadata
         id: meta
@@ -270,11 +267,7 @@ jobs:
           only-fixed: "true"
           output-format: sarif
 
-      - name: Upload receiptwitness scan results to GitHub Security
-        uses: github/codeql-action/upload-sarif@v3
-        if: always()
-        with:
-          sarif_file: ${{ steps.scan.outputs.sarif }}
+
 
       - name: Push Docker image
         if: github.event_name == 'push'
@@ -290,14 +283,14 @@ jobs:
           cache-from: type=gha
 
   build-and-push-api:
-    runs-on: runners-cartsnitch
+    runs-on: ubuntu-latest
     if: github.event_name == 'push'
     needs: [lint, test]
     outputs:
       calver_tag: ${{ steps.calver.outputs.version }}
       sha_tag: sha-${{ github.sha }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
         with:
           fetch-depth: 0
 
@@ -319,13 +312,13 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Log in to GHCR
+      - name: Log in to Gitea registry
         if: github.event_name == 'push'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Extract metadata (API)
         id: meta
@@ -362,11 +355,7 @@ jobs:
           only-fixed: "true"
           output-format: sarif
 
-      - name: Upload api scan results to GitHub Security
-        uses: github/codeql-action/upload-sarif@v3
-        if: always()
-        with:
-          sarif_file: ${{ steps.scan.outputs.sarif }}
+
 
       - name: Push Docker image
         if: github.event_name == 'push'
@@ -381,25 +370,104 @@ jobs:
             APT_CACHE_BUST=${{ github.run_id }}
           cache-from: type=gha
 
+  build-and-push-auth:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+    needs: [lint, test]
+    outputs:
+      calver_tag: ${{ steps.calver.outputs.version }}
+      sha_tag: sha-${{ github.sha }}
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
+        with:
+          fetch-depth: 0
+
+      - name: Generate CalVer tag
+        id: calver
+        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+        run: |
+          DATE_TAG=$(date -u +%Y.%m.%d)
+          EXISTING=$(git tag -l "v${DATE_TAG}*" | sort -V | tail -1)
+          if [ -z "$EXISTING" ]; then VERSION="$DATE_TAG"
+          elif [ "$EXISTING" = "v${DATE_TAG}" ]; then VERSION="${DATE_TAG}.2"
+          else BUILD_NUM=$(echo "$EXISTING" | sed "s/v${DATE_TAG}\.//"); VERSION="${DATE_TAG}.$((BUILD_NUM + 1))"; fi
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+
+      - name: Log in to Docker Hub
+        if: github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Log in to Gitea registry
+        if: github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Extract metadata (auth)
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.AUTH_IMAGE_NAME }}
+          tags: |
+            type=sha,prefix=sha-,format=long
+            type=raw,value=${{ steps.calver.outputs.version }},enable=${{ github.ref == 'refs/heads/main' }}
+            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}
+
+      - name: Build Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./auth
+          file: ./auth/Dockerfile
+          load: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            APT_CACHE_BUST=${{ github.run_id }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Scan auth image for vulnerabilities
+        uses: anchore/scan-action@v5
+        id: scan
+        env:
+          GRYPE_CONFIG: .grype.yaml
+        with:
+          image: "${{ env.REGISTRY }}/${{ env.AUTH_IMAGE_NAME }}:sha-${{ github.sha }}"
+          fail-build: true
+          severity-cutoff: high
+          only-fixed: "true"
+          output-format: sarif
+
+
+
+      - name: Push Docker image
+        if: github.event_name == 'push'
+        uses: docker/build-push-action@v6
+        with:
+          context: ./auth
+          file: ./auth/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            APT_CACHE_BUST=${{ github.run_id }}
+          cache-from: type=gha
+
   deploy-dev:
-    runs-on: runners-cartsnitch
-    needs: [build-and-push, build-and-push-receiptwitness, build-and-push-api]
+    runs-on: ubuntu-latest
+    needs: [build-and-push, build-and-push-receiptwitness, build-and-push-api, build-and-push-auth]
     if: always() && !cancelled() && github.event_name == 'push' && (github.ref == 'refs/heads/dev' || github.ref == 'refs/heads/main')
     steps:
-      - name: Generate GitHub App token
-        id: app-token
-        uses: actions/create-github-app-token@v1
-        with:
-          app-id: ${{ secrets.CARTSNITCH_APP_ID }}
-          private-key: ${{ secrets.CARTSNITCH_APP_PRIVATE_KEY }}
-          owner: ${{ github.repository_owner }}
-          repositories: infra
-
       - name: Checkout infra repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
         with:
           repository: cartsnitch/infra
-          token: ${{ steps.app-token.outputs.token }}
+          token: ${{ secrets.REGISTRY_TOKEN }}
           ref: main
           path: infra
 
@@ -422,7 +490,7 @@ jobs:
         if: needs.build-and-push.result == 'success'
         run: |
           cd infra/apps/overlays/dev
-          kustomize edit set image ghcr.io/cartsnitch/cartsnitch:${{ steps.frontend_tag.outputs.tag }}
+          kustomize edit set image ghcr.io/cartsnitch/cartsnitch=git.farh.net/cartsnitch/cartsnitch:${{ steps.frontend_tag.outputs.tag }}
 
       - name: Determine image tag for receiptwitness
         id: receiptwitness_tag
@@ -437,7 +505,7 @@ jobs:
         if: needs.build-and-push-receiptwitness.result == 'success'
         run: |
           cd infra/apps/overlays/dev
-          kustomize edit set image ghcr.io/cartsnitch/receiptwitness:${{ steps.receiptwitness_tag.outputs.tag }}
+          kustomize edit set image ghcr.io/cartsnitch/receiptwitness=git.farh.net/cartsnitch/receiptwitness:${{ steps.receiptwitness_tag.outputs.tag }}
 
       - name: Determine image tag for api
         id: api_tag
@@ -452,38 +520,44 @@ jobs:
         if: needs.build-and-push-api.result == 'success'
         run: |
           cd infra/apps/overlays/dev
-          kustomize edit set image ghcr.io/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
+          kustomize edit set image ghcr.io/cartsnitch/api=git.farh.net/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
+
+      - name: Determine image tag for auth
+        id: auth_tag
+        run: |
+          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
+            echo "tag=${{ needs.build-and-push-auth.outputs.calver_tag }}" >> "$GITHUB_OUTPUT"
+          else
+            echo "tag=${{ needs.build-and-push-auth.outputs.sha_tag }}" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Update auth image tag
+        if: needs.build-and-push-auth.result == 'success'
+        run: |
+          cd infra/apps/overlays/dev
+          kustomize edit set image ghcr.io/cartsnitch/auth=git.farh.net/cartsnitch/auth:${{ steps.auth_tag.outputs.tag }}
 
       - name: Commit and push to infra
         run: |
           cd infra
           git config user.name "cartsnitch-ci[bot]"
-          git config user.email "cartsnitch-ci[bot]@users.noreply.github.com"
+          git config user.email "cartsnitch-ci[bot]@users.noreply.git.farh.net"
           git add apps/overlays/dev/kustomization.yaml
           git diff --cached --quiet && echo "No image changes to deploy" && exit 0
-          git commit -m "ci(dev): update cartsnitch, receiptwitness, and api images"
+          git commit -m "ci(dev): update cartsnitch, receiptwitness, api, and auth images"
           git pull --rebase origin main
           git push origin main
 
   deploy-uat:
-    runs-on: runners-cartsnitch
-    needs: [build-and-push, build-and-push-receiptwitness, build-and-push-api]
+    runs-on: ubuntu-latest
+    needs: [build-and-push, build-and-push-receiptwitness, build-and-push-api, build-and-push-auth]
     if: always() && !cancelled() && github.event_name == 'push' && (github.ref == 'refs/heads/uat' || github.ref == 'refs/heads/main')
     steps:
-      - name: Generate GitHub App token
-        id: app-token
-        uses: actions/create-github-app-token@v1
-        with:
-          app-id: ${{ secrets.CARTSNITCH_APP_ID }}
-          private-key: ${{ secrets.CARTSNITCH_APP_PRIVATE_KEY }}
-          owner: ${{ github.repository_owner }}
-          repositories: infra
-
       - name: Checkout infra repo
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
         with:
           repository: cartsnitch/infra
-          token: ${{ steps.app-token.outputs.token }}
+          token: ${{ secrets.REGISTRY_TOKEN }}
           ref: main
           path: infra
 
@@ -506,7 +580,7 @@ jobs:
         if: needs.build-and-push.result == 'success'
         run: |
           cd infra/apps/overlays/uat
-          kustomize edit set image ghcr.io/cartsnitch/cartsnitch:${{ steps.frontend_tag.outputs.tag }}
+          kustomize edit set image ghcr.io/cartsnitch/cartsnitch=git.farh.net/cartsnitch/cartsnitch:${{ steps.frontend_tag.outputs.tag }}
 
       - name: Determine image tag for receiptwitness
         id: receiptwitness_tag
@@ -521,7 +595,7 @@ jobs:
         if: needs.build-and-push-receiptwitness.result == 'success'
         run: |
           cd infra/apps/overlays/uat
-          kustomize edit set image ghcr.io/cartsnitch/receiptwitness:${{ steps.receiptwitness_tag.outputs.tag }}
+          kustomize edit set image ghcr.io/cartsnitch/receiptwitness=git.farh.net/cartsnitch/receiptwitness:${{ steps.receiptwitness_tag.outputs.tag }}
 
       - name: Determine image tag for api
         id: api_tag
@@ -536,15 +610,30 @@ jobs:
         if: needs.build-and-push-api.result == 'success'
         run: |
           cd infra/apps/overlays/uat
-          kustomize edit set image ghcr.io/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
+          kustomize edit set image ghcr.io/cartsnitch/api=git.farh.net/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
+
+      - name: Determine image tag for auth
+        id: auth_tag
+        run: |
+          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
+            echo "tag=${{ needs.build-and-push-auth.outputs.calver_tag }}" >> "$GITHUB_OUTPUT"
+          else
+            echo "tag=${{ needs.build-and-push-auth.outputs.sha_tag }}" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Update auth image tag
+        if: needs.build-and-push-auth.result == 'success'
+        run: |
+          cd infra/apps/overlays/uat
+          kustomize edit set image ghcr.io/cartsnitch/auth=git.farh.net/cartsnitch/auth:${{ steps.auth_tag.outputs.tag }}
 
       - name: Commit and push to infra
         run: |
           cd infra
           git config user.name "cartsnitch-ci[bot]"
-          git config user.email "cartsnitch-ci[bot]@users.noreply.github.com"
+          git config user.email "cartsnitch-ci[bot]@users.noreply.git.farh.net"
           git add apps/overlays/uat/kustomization.yaml
           git diff --cached --quiet && echo "No image changes to deploy" && exit 0
-          git commit -m "ci(uat): update cartsnitch, receiptwitness, and api images"
+          git commit -m "ci(uat): update cartsnitch, receiptwitness, api, and auth images"
           git pull --rebase origin main
           git push origin main

api/.gitea/workflows/ci.yml

@@ -15,7 +15,7 @@ permissions:
   packages: write
 
 env:
-  REGISTRY: ghcr.io
+  REGISTRY: git.farh.net
   IMAGE_NAME: cartsnitch/api
 
 jobs:
@@ -130,13 +130,13 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Log in to GHCR
+      - name: Log in to Gitea registry
         if: github.event_name == 'push' && github.ref == 'refs/heads/main'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Extract metadata
         id: meta

api/src/cartsnitch_api/main.py

@@ -6,7 +6,6 @@ from fastapi import APIRouter, FastAPI
 
 from cartsnitch_api.auth.routes import router as auth_router
 from cartsnitch_api.cache import cache_client
-from cartsnitch_api.database import dispose_engine
 from cartsnitch_api.middleware.cors import add_cors_middleware
 from cartsnitch_api.middleware.error_handler import add_error_handlers, add_error_monitor_middleware
 from cartsnitch_api.middleware.rate_limit import add_rate_limit_middleware

auth/tsconfig.json

@@ -12,5 +12,5 @@
     "resolveJsonModule": true
   },
   "include": ["src"],
-  "exclude": ["node_modules", "dist"]
+  "exclude": ["node_modules", "dist", "src/__tests__"]
 }

common/src/cartsnitch_common/database.py

@@ -1,17 +1,36 @@
 """Database engine and session factories for sync and async usage."""
 
 from collections.abc import AsyncGenerator, Generator
+from typing import TYPE_CHECKING
 
 from sqlalchemy import create_engine
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker, create_async_engine
 from sqlalchemy.orm import Session, sessionmaker
 
 from cartsnitch_common.config import settings
 
+if TYPE_CHECKING:
+    from sqlalchemy.engine import Engine
 
-def get_async_engine(url: str | None = None):
-    """Create an async SQLAlchemy engine."""
-    return create_async_engine(url or settings.database_url, echo=settings.debug)
+# Module-level async engine cache — one engine per unique URL, shared across all callers.
+# This prevents pool exhaustion in high-throughput workers (e.g. email-worker hitting
+# DragonflyDB/Postgres repeatedly per message).  pool_size=10, max_overflow=20 gives
+# headroom for bursts while capping max connections at 30 per URL.
+_async_engine_cache: dict[str, "AsyncEngine"] = {}
+
+
+def get_async_engine(url: str | None = None) -> "AsyncEngine":
+    """Get or create a cached async engine for the given URL."""
+    target = url or settings.database_url
+    if target not in _async_engine_cache:
+        _async_engine_cache[target] = create_async_engine(
+            target,
+            echo=settings.debug,
+            pool_size=10,
+            max_overflow=20,
+            pool_pre_ping=True,
+        )
+    return _async_engine_cache[target]
 
 
 def get_sync_engine(url: str | None = None):

package.json

@@ -45,14 +45,16 @@
     "typescript-eslint": "^8.56.1",
     "vite": "^6.4.2",
     "vite-plugin-pwa": "^0.21.2",
-    "vitest": "^3.2.4"
+    "vitest": "^4.1.8"
   },
   "overrides": {
     "@rollup/pluginutils": "5.3.0",
     "flatted": "^3.4.2",
     "serialize-javascript": "7.0.5",
-    "brace-expansion": ">=1.1.13",
+    "brace-expansion": ">=5.0.6",
     "lodash": ">=4.17.24",
-    "minimatch": "^10.2.4"
+    "minimatch": "^10.2.4",
+    "@babel/plugin-transform-modules-systemjs": "^7.29.4",
+    "fast-uri": "^3.1.2"
   }
 }

receiptwitness/src/receiptwitness/queue/email.py

@@ -16,6 +16,29 @@ logger = logging.getLogger(__name__)
 STREAM_KEY = "email:receipts"
 CONSUMER_GROUP = "email-workers"
 
+# Module-level Redis/DragonflyDB connection pool — shared across all worker calls.
+# Without pooling, each call to get_redis() opens a new TCP connection.  In a tight
+# consumer loop this causes ConnectionResetError when DragonflyDB's connection limit
+# is hit under load.  max_connections=30 (10 base + 20 overflow) mirrors the engine pool.
+_redis_pool: aioredis.ConnectionPool | None = None
+
+
+def _get_redis_pool() -> aioredis.ConnectionPool:
+    """Get or create the shared DragonflyDB connection pool."""
+    global _redis_pool
+    if _redis_pool is None:
+        _redis_pool = aioredis.ConnectionPool.from_url(
+            settings.redis_url,
+            decode_responses=True,
+            max_connections=30,
+        )
+    return _redis_pool
+
+
+async def get_redis() -> aioredis.Redis:
+    """Get async Redis/DragonflyDB client backed by a shared connection pool."""
+    return aioredis.Redis(connection_pool=_get_redis_pool())
+
 
 @dataclass
 class EmailJob:
@@ -31,11 +54,6 @@ class EmailJob:
     message_id: str  # from email provider, for dedup
 
 
-async def get_redis() -> aioredis.Redis:
-    """Get async Redis/DragonflyDB client."""
-    return cast(aioredis.Redis, aioredis.from_url(settings.redis_url, decode_responses=True))
-
-
 async def ensure_consumer_group(client: aioredis.Redis) -> None:
     """Create consumer group if it does not exist."""
     try: