diff --git a/pkg/artifactstore/common.go b/pkg/artifactstore/common.go
index 6b96398..e27cac7 100644
--- a/pkg/artifactstore/common.go
+++ b/pkg/artifactstore/common.go
@@ -5,10 +5,21 @@ import (
 	"mrvacommander/pkg/common"
 )
 
+// XX: static types: split by type?
+// Restrict the keys / values for ArtifactLocation and centralize the common ones
+// here 
+const (
+	AF_VAL_BUCKET_RESULTS = "results"
+	AF_VAL_BUCKET_PACKS   = "packs"
+	AF_KEY_BUCKET         = "bucket"
+	AF_KEY_KEY            = "key"
+)
+
 type ArtifactLocation struct {
 	// Data is a map of key-value pairs that describe the location of the artifact.
 	// For example, a simple key-value pair could be "path" -> "/path/to/artifact.tgz".
 	// Alternatively, a more complex example could be "bucket" -> "example", "key" -> "UNIQUE_ARTIFACT_IDENTIFIER".
+	// XX: static types
 	Data map[string]string `json:"data"`
 }
 
diff --git a/pkg/artifactstore/store_memory.go b/pkg/artifactstore/store_memory.go
index 9d4acc0..6a9006a 100644
--- a/pkg/artifactstore/store_memory.go
+++ b/pkg/artifactstore/store_memory.go
@@ -25,7 +25,7 @@ func (store *InMemoryArtifactStore) GetQueryPack(location ArtifactLocation) ([]b
 	store.mu.Lock()
 	defer store.mu.Unlock()
 
-	key := location.Data["key"]
+	key := location.Data[AF_KEY_KEY]
 	data, exists := store.packs[key]
 	if !exists {
 		return nil, fmt.Errorf("query pack not found: %s", key)
@@ -41,10 +41,11 @@ func (store *InMemoryArtifactStore) SaveQueryPack(sessionId int, data []byte) (A
 	key := deriveKeyFromSessionId(sessionId)
 	store.packs[key] = data
 
+	// XX: static types
 	location := ArtifactLocation{
 		Data: map[string]string{
-			"bucket": "packs",
-			"key":    key,
+			AF_KEY_BUCKET: AF_VAL_BUCKET_PACKS,
+			AF_KEY_KEY:    key,
 		},
 	}
 	return location, nil
@@ -55,7 +56,7 @@ func (store *InMemoryArtifactStore) GetResult(location ArtifactLocation) ([]byte
 	store.mu.Lock()
 	defer store.mu.Unlock()
 
-	key := location.Data["key"]
+	key := location.Data[AF_KEY_KEY]
 	data, exists := store.results[key]
 	if !exists {
 		return nil, fmt.Errorf("result not found: %s", key)
@@ -68,7 +69,7 @@ func (store *InMemoryArtifactStore) GetResultSize(location ArtifactLocation) (in
 	store.mu.Lock()
 	defer store.mu.Unlock()
 
-	key := location.Data["key"]
+	key := location.Data[AF_KEY_KEY]
 	data, exists := store.results[key]
 	if !exists {
 		return 0, fmt.Errorf("result not found: %s", key)
@@ -84,10 +85,11 @@ func (store *InMemoryArtifactStore) SaveResult(jobSpec common.JobSpec, data []by
 	key := deriveKeyFromJobSpec(jobSpec)
 	store.results[key] = data
 
+	// XX: static types
 	location := ArtifactLocation{
 		Data: map[string]string{
-			"bucket": "results",
-			"key":    key,
+			AF_KEY_BUCKET: AF_VAL_BUCKET_RESULTS,
+			AF_KEY_KEY:    key,
 		},
 	}
 	return location, nil
diff --git a/pkg/artifactstore/store_minio.go b/pkg/artifactstore/store_minio.go
index 3730d17..2ca544d 100644
--- a/pkg/artifactstore/store_minio.go
+++ b/pkg/artifactstore/store_minio.go
@@ -13,11 +13,6 @@ import (
 	"github.com/minio/minio-go/v7/pkg/credentials"
 )
 
-const (
-	RESULTS_BUCKET_NAME = "results"
-	PACKS_BUCKET_NAME   = "packs"
-)
-
 type MinIOArtifactStore struct {
 	client *minio.Client
 }
@@ -34,12 +29,12 @@ func NewMinIOArtifactStore(endpoint, id, secret string) (*MinIOArtifactStore, er
 	slog.Info("Connected to MinIO artifact store server")
 
 	// Create "results" bucket
-	if err := common.CreateMinIOBucketIfNotExists(minioClient, RESULTS_BUCKET_NAME); err != nil {
+	if err := common.CreateMinIOBucketIfNotExists(minioClient, AF_VAL_BUCKET_RESULTS); err != nil {
 		return nil, fmt.Errorf("could not create results bucket: %v", err)
 	}
 
 	// Create "packs" bucket
-	if err := common.CreateMinIOBucketIfNotExists(minioClient, PACKS_BUCKET_NAME); err != nil {
+	if err := common.CreateMinIOBucketIfNotExists(minioClient, AF_VAL_BUCKET_PACKS); err != nil {
 		return nil, fmt.Errorf("could not create packs bucket: %v", err)
 	}
 
@@ -53,7 +48,7 @@ func (store *MinIOArtifactStore) GetQueryPack(location ArtifactLocation) ([]byte
 }
 
 func (store *MinIOArtifactStore) SaveQueryPack(jobId int, data []byte) (ArtifactLocation, error) {
-	return store.saveArtifact(PACKS_BUCKET_NAME, deriveKeyFromSessionId(jobId), data, "application/gzip")
+	return store.saveArtifact(AF_VAL_BUCKET_PACKS, deriveKeyFromSessionId(jobId), data, "application/gzip")
 }
 
 func (store *MinIOArtifactStore) GetResult(location ArtifactLocation) ([]byte, error) {
@@ -61,8 +56,8 @@ func (store *MinIOArtifactStore) GetResult(location ArtifactLocation) ([]byte, e
 }
 
 func (store *MinIOArtifactStore) GetResultSize(location ArtifactLocation) (int, error) {
-	bucket := location.Data["bucket"]
-	key := location.Data["key"]
+	bucket := location.Data[AF_KEY_BUCKET]
+	key := location.Data[AF_KEY_KEY]
 
 	objectInfo, err := store.client.StatObject(context.Background(), bucket, key, minio.StatObjectOptions{})
 	if err != nil {
@@ -77,12 +72,12 @@ func (store *MinIOArtifactStore) GetResultSize(location ArtifactLocation) (int,
 }
 
 func (store *MinIOArtifactStore) SaveResult(jobSpec common.JobSpec, data []byte) (ArtifactLocation, error) {
-	return store.saveArtifact(RESULTS_BUCKET_NAME, deriveKeyFromJobSpec(jobSpec), data, "application/zip")
+	return store.saveArtifact(AF_VAL_BUCKET_RESULTS, deriveKeyFromJobSpec(jobSpec), data, "application/zip")
 }
 
 func (store *MinIOArtifactStore) getArtifact(location ArtifactLocation) ([]byte, error) {
-	bucket := location.Data["bucket"]
-	key := location.Data["key"]
+	bucket := location.Data[AF_KEY_BUCKET]
+	key := location.Data[AF_KEY_KEY]
 
 	object, err := store.client.GetObject(context.Background(), bucket, key, minio.GetObjectOptions{})
 	if err != nil {
@@ -98,18 +93,21 @@ func (store *MinIOArtifactStore) getArtifact(location ArtifactLocation) ([]byte,
 	return data, nil
 }
 
-func (store *MinIOArtifactStore) saveArtifact(bucket, key string, data []byte, contentType string) (ArtifactLocation, error) {
-	_, err := store.client.PutObject(context.Background(), bucket, key, bytes.NewReader(data), int64(len(data)), minio.PutObjectOptions{
-		ContentType: contentType,
-	})
+func (store *MinIOArtifactStore) saveArtifact(bucket, key string, data []byte,
+	contentType string) (ArtifactLocation, error) {
+	_, err := store.client.PutObject(context.Background(), bucket, key,
+		bytes.NewReader(data), int64(len(data)), minio.PutObjectOptions{
+			ContentType: contentType,
+		})
 	if err != nil {
 		return ArtifactLocation{}, err
 	}
 
+	// XX: static types
 	location := ArtifactLocation{
 		Data: map[string]string{
-			"bucket": bucket,
-			"key":    key,
+			AF_KEY_BUCKET: bucket,
+			AF_KEY_KEY:    key,
 		},
 	}
 
diff --git a/pkg/codeql/types.go b/pkg/codeql/types.go
index e8b156a..3e84e49 100644
--- a/pkg/codeql/types.go
+++ b/pkg/codeql/types.go
@@ -26,8 +26,10 @@ const (
 )
 
 type SarifRun struct {
+	// XX: static types
 	VersionControlProvenance []interface{} `json:"versionControlProvenance,omitempty"`
-	Results                  []interface{} `json:"results"`
+	// XX: never set, only read
+	Results []interface{} `json:"results"`
 }
 
 type Sarif struct {
diff --git a/pkg/qldbstore/interfaces.go b/pkg/qldbstore/interfaces.go
index 37501a8..04bbd6a 100644
--- a/pkg/qldbstore/interfaces.go
+++ b/pkg/qldbstore/interfaces.go
@@ -8,6 +8,7 @@ type CodeQLDatabaseLocation struct {
 	// `data` is a map of key-value pairs that describe the location of the database.
 	// For example, a simple key-value pair could be "path" -> "/path/to/database.zip".
 	// A more complex implementation could be "bucket" -> "example", "key" -> "unique_identifier".
+	// XX: static types
 	data map[string]string
 }
 
diff --git a/pkg/qldbstore/qldbstore_minio.go b/pkg/qldbstore/qldbstore_minio.go
index b1e0166..8c04717 100644
--- a/pkg/qldbstore/qldbstore_minio.go
+++ b/pkg/qldbstore/qldbstore_minio.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"log/slog"
+	"mrvacommander/pkg/artifactstore"
 	"mrvacommander/pkg/common"
 
 	"github.com/minio/minio-go/v7"
@@ -58,8 +59,8 @@ func (store *MinIOCodeQLDatabaseStore) FindAvailableDBs(analysisReposRequested [
 }
 
 func (store *MinIOCodeQLDatabaseStore) GetDatabase(location CodeQLDatabaseLocation) ([]byte, error) {
-	bucket := location.data["bucket"]
-	key := location.data["key"]
+	bucket := location.data[artifactstore.AF_KEY_BUCKET]
+	key := location.data[artifactstore.AF_KEY_KEY]
 
 	object, err := store.client.GetObject(context.Background(), bucket, key, minio.GetObjectOptions{})
 	if err != nil {
diff --git a/pkg/queue/queue_rabbitmq.go b/pkg/queue/queue_rabbitmq.go
index f4fe720..eba861e 100644
--- a/pkg/queue/queue_rabbitmq.go
+++ b/pkg/queue/queue_rabbitmq.go
@@ -34,6 +34,7 @@ func NewRabbitMQQueue(
 	const (
 		tryCount         = 5
 		retryDelaySec    = 3
+		// XX: static typing?
 		jobsQueueName    = "tasks"
 		resultsQueueName = "results"
 	)