diff --git a/.gitea/workflows/refresh_showcase_data.yml b/.gitea/workflows/refresh_showcase_data.yml
new file mode 100644
index 0000000..9ac3637
--- /dev/null
+++ b/.gitea/workflows/refresh_showcase_data.yml
@@ -0,0 +1,41 @@
+name: Refresh Showcase Data
+
+on:
+  schedule:
+    # Run daily at 3 AM UTC
+    - cron: '0 3 * * *'
+  workflow_dispatch: # Allow manual triggering
+
+jobs:
+  refresh-data:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ vars.PYTHON_VERSION }}
+
+      - name: Install uv
+        run: curl -LsSf https://astral.sh/uv/install.sh | sh
+
+      - name: Install dependencies
+        run: |
+          uv sync --no-dev --all-extras
+
+      - name: Run showcase data seeding script
+        env:
+          POSTGRES_URI: ${{ secrets.POSTGRES_URI }}
+        run: |
+          uv run python scripts/seed_showcase_data.py
+
+      - name: Notify on success
+        if: success()
+        run: echo "✅ Showcase data refreshed successfully"
+
+      - name: Notify on failure
+        if: failure()
+        run: echo "❌ Failed to refresh showcase data"
diff --git a/scripts/seed_showcase_data.py b/scripts/seed_showcase_data.py
new file mode 100644
index 0000000..795349a
--- /dev/null
+++ b/scripts/seed_showcase_data.py
@@ -0,0 +1,185 @@
+"""Seed test data into the database for demo purposes."""
+
+import sys
+import os
+from pathlib import Path
+from datetime import datetime
+
+# Add parent directory to path to import baby_monitor modules
+sys.path.insert(0, str(Path(__file__).parent.parent / "src"))
+
+# Import after path is set up
+from baby_monitor.repositories.dependencies.get_database import (  # noqa: E402
+    get_database,
+    init_db,
+)
+from baby_monitor.repositories.user.sqlite_user import (  # noqa: E402
+    DatabaseUserRepository,
+)
+from baby_monitor.repositories.child.sqlite_child import (  # noqa: E402
+    DatabaseChildRepository,
+)
+from baby_monitor.repositories.feeding.sqlite_feeding import (  # noqa: E402
+    DatabaseFeedingRepository,
+)
+from baby_monitor.repositories.diaper_change.sqlite_diaper_change import (  # noqa: E402, E501
+    DatabaseDiaperChangeRepository,
+)
+from baby_monitor.repositories.sleep.sqlite_sleep import (  # noqa: E402
+    DatabaseSleepRepository,
+)
+from baby_monitor.routers.auth import hash_password  # noqa: E402
+from showcase_data_definitions import generate_showcase_data  # noqa: E402
+
+
+def seed_database(reference_time: datetime | None = None) -> None:
+    """
+    Seed the database with test data.
+
+    This function is idempotent - it will check if test users exist
+    and either create them or update timestamps of existing data.
+
+    Args:
+        reference_time: The "now" time to use for generating timestamps.
+            Defaults to current time.
+    """
+    # Initialize database
+    init_db()
+    db = next(get_database())
+
+    try:
+        # Initialize repositories
+        user_repo = DatabaseUserRepository(db)
+        child_repo = DatabaseChildRepository(db)
+        feeding_repo = DatabaseFeedingRepository(db)
+        diaper_repo = DatabaseDiaperChangeRepository(db)
+        sleep_repo = DatabaseSleepRepository(db)
+
+        # Generate showcase data
+        test_data = generate_showcase_data(reference_time)
+
+        print("Starting database seeding...")
+        print(f"Reference time: {test_data['reference_time']}")
+
+        # Create or get showcase users
+        user_ids = []
+        for user_data in test_data["users"]:
+            # Check if user exists
+            existing_user = user_repo.get_by_username(user_data["username"])
+
+            if existing_user:
+                print(f"✓ User '{user_data['username']}' already exists")
+                user_ids.append(existing_user["id"])
+            else:
+                # Create new user
+                hashed_pw = hash_password(user_data["password"])
+                user_id = user_repo.create(
+                    username=user_data["username"],
+                    hashed_password=hashed_pw,
+                )
+                user_ids.append(user_id["id"])
+                print(f"✓ Created user '{user_data['username']}'")
+
+        # Create or get shared child
+        child_data = test_data["child"]
+
+        # Check if child exists for first user
+        existing_children = child_repo.get_by_user_id(user_ids[0])
+        child_id: int | None = None
+
+        # Look for existing child with matching name
+        for child in existing_children:
+            if child["name"] == child_data["name"]:
+                child_id = child["id"]
+                print(f"✓ Child '{child_data['name']}' already exists")
+                break
+
+        if child_id is None:
+            # Create new child
+            child_id = child_repo.create(
+                name=child_data["name"],
+                birth_time=child_data["birth_time"],
+                birth_weight=child_data["birth_weight"],
+                user_id=user_ids[0],
+            )
+            print(f"✓ Created child '{child_data['name']}'")
+
+        # Share child with second user if not already shared
+        parent_ids = child_repo.get_parent_ids(child_id)
+        if user_ids[1] not in parent_ids:
+            child_repo.add_parent(child_id, user_ids[1])
+            msg = f"✓ Shared child with '{test_data['users'][1]['username']}'"
+            print(msg)
+
+        # Ensure child_id is set
+        assert child_id is not None, "Child ID must be set at this point"
+
+        # Clear existing logs to avoid duplicates
+        print("Clearing existing logs...")
+
+        # Get all logs for this child
+        existing_feedings = feeding_repo.get_by_child_id(child_id)
+        for feeding in existing_feedings:
+            feeding_repo.delete(feeding["id"])
+
+        existing_diapers = diaper_repo.get_by_child_id(child_id)
+        for diaper in existing_diapers:
+            diaper_repo.delete(diaper["id"])
+
+        existing_sleep = sleep_repo.get_by_child_id(child_id)
+        for sleep in existing_sleep:
+            sleep_repo.delete(sleep["id"])
+
+        print("✓ Cleared existing logs")
+
+        # Add feeding logs
+        print(f"Adding {len(test_data['feedings'])} feeding logs...")
+        for feeding in test_data["feedings"]:
+            feeding_repo.create(
+                child_id=child_id,
+                start_time=feeding["start_time"],
+                end_time=feeding["end_time"],
+                feeding_type=feeding["feeding_type"],
+            )
+        print(f"✓ Added {len(test_data['feedings'])} feedings")
+
+        # Add diaper changes
+        print(f"Adding {len(test_data['diapers'])} diaper changes...")
+        for diaper in test_data["diapers"]:
+            diaper_repo.create(
+                child_id=child_id,
+                change_time=diaper["time"],
+                poop_color=diaper.get("poop_color"),
+                poop_amount=diaper.get("poop_amount"),
+                pee_color=diaper.get("pee_color"),
+                pee_amount=diaper.get("pee_amount"),
+            )
+        print(f"✓ Added {len(test_data['diapers'])} diaper changes")
+
+        # Add sleep sessions
+        print(f"Adding {len(test_data['sleep'])} sleep sessions...")
+        for sleep in test_data["sleep"]:
+            sleep_repo.create(
+                child_id=child_id,
+                start_time=sleep["start_time"],
+                end_time=sleep["end_time"],
+            )
+        print(f"✓ Added {len(test_data['sleep'])} sleep sessions")
+
+        db.commit()
+        print("\n✅ Database seeding completed successfully!")
+        print("\nTest user credentials:")
+        print(f"  Username: {test_data['users'][0]['username']}")
+        print(f"  Password: {test_data['users'][0]['password']}")
+        print("  (Both users share the same password)")
+
+    except Exception as e:
+        db.rollback()
+        print(f"\n❌ Error seeding database: {e}")
+        raise
+    finally:
+        db.close()
+
+
+if __name__ == "__main__":
+    seed_database()
diff --git a/scripts/showcase_data_definitions.py b/scripts/showcase_data_definitions.py
new file mode 100644
index 0000000..ea37a5c
--- /dev/null
+++ b/scripts/showcase_data_definitions.py
@@ -0,0 +1,281 @@
+"""Definition of showcase data to be used for presenting the app."""
+
+
+from datetime import datetime, timedelta
+import random
+
+# User credentials
+SHOWCASE_USERS = [
+    {
+        "username": "user",
+        "password": "demo123",  # Will be hashed when inserted
+    },
+    {
+        "username": "user2",
+        "password": "demo123",  # Will be hashed when inserted
+    },
+]
+
+# Shared child (14 days old)
+CHILD_AGE_DAYS = 14
+
+
+def get_child_data(reference_time: datetime) -> dict:
+    """Get child data with birth time relative to reference time."""
+    birth_time = reference_time - timedelta(days=CHILD_AGE_DAYS)
+    return {
+        "name": "Emma Rose",
+        "birth_time": birth_time,
+        "birth_weight": 3420,  # grams (7.5 lbs)
+    }
+
+
+def get_feeding_schedule(reference_time: datetime) -> list[dict]:
+    """
+    Generate realistic feeding schedule for the last 14 days.
+
+    Newborns feed every 2-3 hours initially, gradually spacing out
+    to 3-4 hours.
+    """
+    feedings: list[dict] = []
+    current_time = reference_time - timedelta(days=CHILD_AGE_DAYS)
+    end_time = reference_time
+    
+    feeding_types = ["left_breast", "right_breast", "bottle"]
+    
+    # Day-by-day feeding patterns
+    day_number = 0
+    while current_time < end_time:
+        age_in_days = day_number
+        
+        # Newborns feed more frequently
+        if age_in_days < 3:
+            interval_hours = random.uniform(2, 2.5)
+            duration_minutes = random.randint(15, 25)
+        elif age_in_days < 7:
+            interval_hours = random.uniform(2.5, 3)
+            duration_minutes = random.randint(20, 30)
+        else:
+            interval_hours = random.uniform(3, 3.5)
+            duration_minutes = random.randint(20, 35)
+        
+        # Alternate between breasts and occasional bottle
+        if random.random() < 0.2:  # 20% bottle feeding
+            feeding_type = "bottle"
+        else:
+            # Alternate breasts
+            feeding_type = feeding_types[len(feedings) % 2]
+        
+        start_time = current_time
+        end_time_feeding = start_time + timedelta(minutes=duration_minutes)
+        
+        feedings.append({
+            "start_time": start_time,
+            "end_time": end_time_feeding,
+            "feeding_type": feeding_type,
+        })
+        
+        current_time += timedelta(hours=interval_hours)
+        
+        # Move to next day
+        prev_date = (
+            current_time - timedelta(hours=interval_hours)
+        ).date()
+        if current_time.date() != prev_date:
+            day_number += 1
+    
+    return feedings
+
+
+def get_diaper_changes(reference_time: datetime) -> list[dict]:
+    """
+    Generate realistic diaper changes for the last 14 days.
+    
+    - First 2-3 days: Black/dark (meconium), minimal pee
+    - Days 3-5: Transition to yellow, more frequent
+    - Days 5+: Regular yellow stools, normal pee patterns
+    - 8-10 diaper changes per day initially, settling to 6-8
+    """
+    diapers = []
+    current_time = reference_time - timedelta(days=CHILD_AGE_DAYS)
+    end_time = reference_time
+    
+    day_number = 0
+    
+    while current_time < end_time:
+        age_in_days = day_number
+        
+        # Determine number of diaper changes per day based on age
+        if age_in_days < 3:
+            changes_per_day = random.randint(8, 10)
+        elif age_in_days < 7:
+            changes_per_day = random.randint(7, 9)
+        else:
+            changes_per_day = random.randint(6, 8)
+        
+        # Distribute changes throughout the day
+        day_start = current_time.replace(
+            hour=0, minute=0, second=0, microsecond=0
+        )
+        day_end = day_start + timedelta(days=1)
+        
+        for _ in range(changes_per_day):
+            # Random time during the day
+            random_seconds = random.randint(0, 86400)
+            change_time = day_start + timedelta(seconds=random_seconds)
+            
+            if change_time >= end_time:
+                break
+            
+            # Determine diaper contents
+            has_poop = random.random() < 0.4  # 40% have poop
+            # 90% have pee, or always if no poop
+            has_pee = random.random() < 0.9 or not has_poop
+            
+            diaper = {
+                "time": change_time,
+                "has_poop": has_poop,
+                "has_pee": has_pee,
+            }
+            
+            # Poop characteristics based on age
+            if has_poop:
+                if age_in_days < 2:
+                    # Meconium phase
+                    diaper["poop_color"] = "black"
+                    diaper["poop_amount"] = "light"
+                elif age_in_days < 4:
+                    # Transition phase
+                    colors = ["black", "green", "yellow"]
+                    diaper["poop_color"] = random.choice(colors)
+                    amounts = ["light", "medium"]
+                    diaper["poop_amount"] = random.choice(amounts)
+                else:
+                    # Normal phase
+                    colors = ["yellow", "yellow", "yellow", "green"]
+                    diaper["poop_color"] = random.choice(colors)
+                    # Amount increases with age
+                    if age_in_days < 7:
+                        amounts = ["light", "medium"]
+                        diaper["poop_amount"] = random.choice(amounts)
+                    else:
+                        amounts = ["medium", "heavy"]
+                        diaper["poop_amount"] = random.choice(amounts)
+            
+            # Pee characteristics based on age
+            if has_pee:
+                if age_in_days < 2:
+                    # Very light pee initially
+                    diaper["pee_amount"] = "light"
+                    diaper["pee_color"] = random.choice(["clear", "yellow"])
+                elif age_in_days < 5:
+                    # Increasing output
+                    diaper["pee_amount"] = random.choice(["light", "medium"])
+                    diaper["pee_color"] = random.choice(["clear", "yellow"])
+                else:
+                    # Normal output
+                    if age_in_days < 10:
+                        amounts = ["medium", "medium", "heavy"]
+                        diaper["pee_amount"] = random.choice(amounts)
+                    else:
+                        amounts = ["medium", "heavy", "heavy"]
+                        diaper["pee_amount"] = random.choice(amounts)
+                    colors = ["clear", "yellow", "yellow"]
+                    diaper["pee_color"] = random.choice(colors)
+            
+            diapers.append(diaper)
+        
+        day_number += 1
+        current_time = day_end
+    
+    # Sort by time
+    diapers.sort(key=lambda x: x["time"])
+    return diapers
+
+
+def get_sleep_sessions(reference_time: datetime) -> list[dict]:
+    """
+    Generate realistic sleep patterns for the last 14 days.
+    
+    Newborns sleep 16-18 hours per day in short bursts (30min - 4 hours).
+    Sleep gradually consolidates over time.
+    """
+    sleep_sessions = []
+    current_time = reference_time - timedelta(days=CHILD_AGE_DAYS)
+    end_time = reference_time
+    
+    day_number = 0
+    
+    while current_time < end_time:
+        age_in_days = day_number
+        
+        # Sleep patterns evolve with age
+        if age_in_days < 3:
+            # Very short, frequent naps
+            avg_wake_time = 1.5  # hours
+            sleep_duration_range = (30, 120)  # minutes
+        elif age_in_days < 7:
+            # Slightly longer sleep periods
+            avg_wake_time = 2
+            sleep_duration_range = (45, 180)
+        else:
+            # More consolidated sleep
+            avg_wake_time = 2.5
+            sleep_duration_range = (60, 240)
+        
+        # Random wake time with variation
+        wake_minutes = random.randint(
+            int(avg_wake_time * 45),
+            int(avg_wake_time * 75)
+        )
+        
+        # Sleep start time
+        start_time = current_time + timedelta(minutes=wake_minutes)
+        
+        if start_time >= end_time:
+            break
+        
+        # Sleep duration
+        duration_minutes = random.randint(*sleep_duration_range)
+        
+        # Longer sleep at night
+        if 20 <= start_time.hour or start_time.hour < 6:
+            duration_minutes = int(duration_minutes * 1.3)
+        
+        end_time_sleep = start_time + timedelta(minutes=duration_minutes)
+        
+        sleep_sessions.append({
+            "start_time": start_time,
+            "end_time": end_time_sleep,
+        })
+        
+        current_time = end_time_sleep
+        birth_time = reference_time - timedelta(days=CHILD_AGE_DAYS)
+        day_number = (current_time - birth_time).days
+    
+    return sleep_sessions
+
+
+def generate_showcase_data(reference_time: datetime | None = None) -> dict:
+    """
+    Generate all test data with timestamps relative to reference time.
+
+    Args:
+        reference_time: The "now" time to use as reference.
+            Defaults to current time.
+
+    Returns:
+        Dictionary containing all test data
+    """
+    if reference_time is None:
+        reference_time = datetime.now()
+    
+    return {
+        "users": SHOWCASE_USERS,
+        "child": get_child_data(reference_time),
+        "feedings": get_feeding_schedule(reference_time),
+        "diapers": get_diaper_changes(reference_time),
+        "sleep": get_sleep_sessions(reference_time),
+        "reference_time": reference_time,
+    }
+