diff --git a/docker-compose.yml b/docker-compose.yml
index 922610f..7ec3d59 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -26,6 +26,7 @@ services:
     volumes:
       - pb_data:/htwkalender-data-manager/data # for production with volume
       # - ./data-manager:/htwkalender/data # for development with bind mount from project directory
+    user: "ical"
 
   htwkalender-ical:
     build:
diff --git a/services/data-manager/Dockerfile b/services/data-manager/Dockerfile
index f1bcae8..9e52f5d 100644
--- a/services/data-manager/Dockerfile
+++ b/services/data-manager/Dockerfile
@@ -29,19 +29,20 @@ COPY common/. ./common
 RUN CGO_ENABLED=1 GOOS=linux go build -o /htwkalender-data-manager data-manager/main.go
 
 # production stage
-FROM alpine:latest AS prod
+FROM alpine:3.20.1 AS prod
 
 WORKDIR /htwkalender-data-manager
 
 ARG USER=ical
-RUN adduser -Ds /bin/sh $USER && \
-    chown $USER:$USER ./
+RUN adduser -Ds /bin/sh "$USER" && \
+    chown "$USER":"$USER" ./
 
 USER $USER
 RUN mkdir -p data
 
 # copies executable from build container
-COPY --chown=$USER:$USER --from=build /htwkalender-data-manager ./
+COPY --chown=$USER:$USER --chmod=644 --from=build /htwkalender-data-manager ./
+RUN chmod +x main
 
 # Expose port 8090 to the outside world
 EXPOSE 8090
@@ -54,6 +55,12 @@ FROM golang:1.21.6 AS dev
 # Set the Current Working Directory inside the container
 WORKDIR /htwkalender-data-manager
 
+ARG USER=ical
+RUN adduser "$USER" && \
+    chown "$USER":"$USER" ./ \
+    && mkdir -p /htwkalender-data-manager/data \
+    && chown "$USER":"$USER" /htwkalender-data-manager/data
+
 # Copy go mod and sum files
 COPY go.mod go.sum ./
 RUN go mod download
@@ -68,5 +75,7 @@ RUN CGO_ENABLED=1 GOOS=linux go build -o /htwkalender-data-manager data-manager/
 # Expose port 8091 to the outside world
 EXPOSE 8091
 
+USER $USER
+
 # Entry point
 ENTRYPOINT ["./main", "serve"]
\ No newline at end of file
diff --git a/services/data-manager/main.go b/services/data-manager/main.go
index c49c157..1e50b50 100644
--- a/services/data-manager/main.go
+++ b/services/data-manager/main.go
@@ -27,7 +27,7 @@ import (
 	"strings"
 )
 
-func main() {
+func setupApp() *pocketbase.PocketBase {
 	app := pocketbase.New()
 
 	// loosely check if it was executed using "go run"
@@ -44,8 +44,12 @@ func main() {
 	service.AddRoutes(app)
 	service.AddSchedules(app)
 
+	return app
+}
+
+func main() {
+	app := setupApp()
 	if err := app.Start(); err != nil {
 		slog.Error("Failed to start app: ", "error", err)
 	}
-
 }
diff --git a/services/data-manager/main_test.go b/services/data-manager/main_test.go
new file mode 100644
index 0000000..773d375
--- /dev/null
+++ b/services/data-manager/main_test.go
@@ -0,0 +1,42 @@
+//Calendar implementation for the HTWK Leipzig timetable. Evaluation and display of the individual dates in iCal format.
+//Copyright (C) 2024 HTWKalender support@htwkalender.de
+
+//This program is free software: you can redistribute it and/or modify
+//it under the terms of the GNU Affero General Public License as published by
+//the Free Software Foundation, either version 3 of the License, or
+//(at your option) any later version.
+
+//This program is distributed in the hope that it will be useful,
+//but WITHOUT ANY WARRANTY; without even the implied warranty of
+//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//GNU Affero General Public License for more details.
+
+//You should have received a copy of the GNU Affero General Public License
+//along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"testing"
+)
+
+func Test_setupApp(t *testing.T) {
+	tests := []struct {
+		name string
+	}{
+		{
+			name: "Test setupApp",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			app := setupApp()
+			go func() {
+				if err := app.Start(); err != nil {
+					t.Errorf("Failed to start app: %v", err)
+					return
+				}
+			}()
+		})
+	}
+}
diff --git a/services/data-manager/service/fetch/v1/fetchSeminarEventService_test.go b/services/data-manager/service/fetch/v1/fetchSeminarEventService_test.go
index 10b55cd..8f88b4a 100644
--- a/services/data-manager/service/fetch/v1/fetchSeminarEventService_test.go
+++ b/services/data-manager/service/fetch/v1/fetchSeminarEventService_test.go
@@ -501,3 +501,122 @@ func Test_replaceTimeForDate(t *testing.T) {
 		})
 	}
 }
+
+func Test_isSummerSemester(t *testing.T) {
+	type args struct {
+		month time.Month
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "Test Summer March",
+			args: args{
+				month: time.March,
+			},
+			want: true,
+		},
+		{
+			name: "Test Summer September",
+			args: args{
+				month: time.September,
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := isSummerSemester(tt.args.month); got != tt.want {
+				t.Errorf("isSummerSemester() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_isWinterSemester(t *testing.T) {
+	type args struct {
+		month time.Month
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			name: "Test Winter March",
+			args: args{
+				month: time.March,
+			},
+			want: true,
+		},
+		{
+			name: "Test Winter September",
+			args: args{
+				month: time.September,
+			},
+			want: true,
+		},
+		{
+			name: "Test Winter November",
+			args: args{
+				month: time.November,
+			},
+			want: true,
+		},
+		{
+			name: "Test Winter February",
+			args: args{
+				month: time.February,
+			},
+			want: true,
+		},
+		{
+			name: "Test Winter June",
+			args: args{
+				month: time.June,
+			},
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := isWinterSemester(tt.args.month); got != tt.want {
+				t.Errorf("isWinterSemester() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_parseSeminarGroup(t *testing.T) {
+	type args struct {
+		result string
+	}
+	tests := []struct {
+		name string
+		args args
+		want model.SeminarGroup
+	}{
+		{
+			name: "Test 1",
+			args: args{
+				result: "B435 SBB  (wpf) & B348 BIB (pf) 5. FS",
+			},
+			want: model.SeminarGroup{
+				Events: []model.Event{
+					{
+						Name: "B435 SBB  (wpf) & B348 BIB (pf) 5. FS",
+					},
+				},
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := parseSeminarGroup(tt.args.result); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("parseSeminarGroup() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/services/data-manager/sonar-project.properties b/services/data-manager/sonar-project.properties
index a0ad568..c9b68d8 100644
--- a/services/data-manager/sonar-project.properties
+++ b/services/data-manager/sonar-project.properties
@@ -1,2 +1,3 @@
 sonar.projectKey=HTWKalender
 sonar.qualitygate.wait=true
+sonar.exclusions=migrations/**
\ No newline at end of file