Implement persistent storage and the pressure algorithm using PostgreSQL database

.github/workflows/tests.yaml

@@ -26,6 +26,31 @@ jobs:
           go fmt ./...
           git diff --exit-code
 
+      - name: Wait for rabbitmq
+        run: |
+          until curl -fs http://localhost:15672;
+            do echo "waiting for rabbit mq"
+            sleep 2
+          done
+
       - name: Build and Test
+        env:
+          POSTGRESQL_CONNECT_STRING: postgres://postgres:postgres@localhost:5432/postgres
+          RABBITMQ_CONNECT_STRING: amqp://guest:guest@localhost:5672/
+          APP_PORT: 8080
+          APP_WEBHOOK_SECRET_VALUE: fake-secret
         run: |
           go test -v -cover -race ./...
+
+    services:
+      postgres:
+        image: postgres:latest
+        env:
+          POSTGRES_PASSWORD: postgres
+        ports:
+          - 5432:5432
+      rabbitmq:
+        image: rabbitmq:3-management
+        ports:
+          - 5672:5672
+          - 15672:15672

go.mod

@@ -3,12 +3,25 @@ module github.com/canonical/mayfly
 go 1.24.6
 
 require (
+	github.com/golang-migrate/migrate/v4 v4.19.0
 	github.com/rabbitmq/amqp091-go v1.10.0
 	github.com/stretchr/testify v1.11.1
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/hashicorp/errwrap v1.1.0 // indirect
+	github.com/hashicorp/go-multierror v1.1.1 // indirect
+	github.com/jackc/pgerrcode v0.0.0-20220416144525-469b46aa5efa // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/pgx/v5 v5.7.6 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	golang.org/x/crypto v0.37.0 // indirect
+	golang.org/x/sync v0.13.0 // indirect
+	golang.org/x/text v0.24.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,14 +1,102 @@
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+github.com/Azure/go-ansiterm v0.0.0-20230124172434-306776ec8161/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
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