Initial commit - SoundWave v1.0

- Full PWA support with offline capabilities
- Comprehensive search across songs, playlists, and channels
- Offline playlist manager with download tracking
- Pre-built frontend for zero-build deployment
- Docker-based deployment with docker compose
- Material-UI dark theme interface
- YouTube audio download and management
- Multi-user authentication support

backend/channel/models.py

@@ -0,0 +1,71 @@
+"""Channel models"""
+
+from django.db import models
+from django.contrib.auth import get_user_model
+
+User = get_user_model()
+
+
+class Channel(models.Model):
+    """YouTube channel model"""
+    # User isolation
+    owner = models.ForeignKey(
+        User, 
+        on_delete=models.CASCADE, 
+        related_name='channels',
+        help_text="User who owns this channel subscription"
+    )
+    youtube_account = models.ForeignKey(
+        'user.UserYouTubeAccount',
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name='channels',
+        help_text="YouTube account used to subscribe to this channel"
+    )
+    
+    channel_id = models.CharField(max_length=50, db_index=True)
+    channel_name = models.CharField(max_length=200)
+    channel_description = models.TextField(blank=True)
+    channel_thumbnail = models.URLField(max_length=500, blank=True)
+    subscribed = models.BooleanField(default=True)
+    subscriber_count = models.IntegerField(default=0)
+    video_count = models.IntegerField(default=0)
+    last_refreshed = models.DateTimeField(auto_now=True)
+    created_date = models.DateTimeField(auto_now_add=True)
+    
+    # Status tracking
+    active = models.BooleanField(default=True, help_text="Channel is active and available")
+    sync_status = models.CharField(
+        max_length=20,
+        choices=[
+            ('pending', 'Pending'),
+            ('syncing', 'Syncing'),
+            ('success', 'Success'),
+            ('failed', 'Failed'),
+            ('stale', 'Stale'),
+        ],
+        default='pending',
+        help_text="Current sync status"
+    )
+    error_message = models.TextField(blank=True, help_text="Last error message if sync failed")
+    downloaded_count = models.IntegerField(default=0, help_text="Downloaded videos count")
+    
+    # Download settings per channel
+    auto_download = models.BooleanField(default=True, help_text="Auto-download new videos from this channel")
+    download_quality = models.CharField(
+        max_length=20,
+        default='auto',
+        choices=[('auto', 'Auto'), ('low', 'Low'), ('medium', 'Medium'), ('high', 'High'), ('ultra', 'Ultra')]
+    )
+
+    class Meta:
+        ordering = ['channel_name']
+        unique_together = ('owner', 'channel_id')  # Each user can subscribe once per channel
+        indexes = [
+            models.Index(fields=['owner', 'channel_id']),
+            models.Index(fields=['owner', 'subscribed']),
+        ]
+
+    def __str__(self):
+        return f"{self.owner.username} - {self.channel_name}"