Fix: Include backend/audio Django app in repository

backend/audio/models.py

@@ -0,0 +1,100 @@
+"""Audio models"""
+
+from django.db import models
+from django.contrib.auth import get_user_model
+
+User = get_user_model()
+
+
+class Audio(models.Model):
+    """Audio file model"""
+    # User isolation
+    owner = models.ForeignKey(
+        User,
+        on_delete=models.CASCADE,
+        related_name='audio_files',
+        help_text="User who owns this audio file"
+    )
+    
+    youtube_id = models.CharField(max_length=50, db_index=True)
+    title = models.CharField(max_length=500)
+    description = models.TextField(blank=True)
+    channel_id = models.CharField(max_length=50, db_index=True)
+    channel_name = models.CharField(max_length=200)
+    duration = models.IntegerField(help_text="Duration in seconds")
+    file_path = models.CharField(max_length=500)
+    file_size = models.BigIntegerField(help_text="File size in bytes")
+    thumbnail_url = models.URLField(max_length=500, blank=True)
+    published_date = models.DateTimeField()
+    downloaded_date = models.DateTimeField(auto_now_add=True)
+    view_count = models.IntegerField(default=0)
+    like_count = models.IntegerField(default=0)
+    audio_format = models.CharField(max_length=20, default='m4a')
+    bitrate = models.IntegerField(null=True, blank=True, help_text="Bitrate in kbps")
+    
+    # Playback tracking
+    play_count = models.IntegerField(default=0)
+    last_played = models.DateTimeField(null=True, blank=True)
+    
+    class Meta:
+        ordering = ['-published_date']
+        unique_together = ('owner', 'youtube_id')  # Each user can have one copy of each video
+        indexes = [
+            models.Index(fields=['owner', 'youtube_id']),
+            models.Index(fields=['owner', 'channel_id']),
+            models.Index(fields=['owner', '-published_date']),
+        ]
+
+    def __str__(self):
+        return f"{self.owner.username} - {self.title}"
+    
+    @property
+    def downloaded(self):
+        """Check if audio file has been downloaded"""
+        return bool(self.file_path)
+    
+    @property
+    def has_lyrics(self):
+        """Check if audio has lyrics"""
+        return hasattr(self, 'lyrics') and self.lyrics.has_lyrics
+
+
+class Channel(models.Model):
+    """YouTube channel model"""
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='audio_channels')
+    channel_id = models.CharField(max_length=100)
+    channel_name = models.CharField(max_length=255)
+    channel_description = models.TextField(blank=True)
+    channel_thumbnail = models.URLField(blank=True)
+    subscribed = models.BooleanField(default=False)
+    subscriber_count = models.IntegerField(default=0)
+    video_count = models.IntegerField(default=0)
+    last_updated = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        unique_together = ('user', 'channel_id')
+        indexes = [
+            models.Index(fields=['user', 'channel_id']),
+            models.Index(fields=['user', 'subscribed']),
+        ]
+
+    def __str__(self):
+        return f"{self.channel_name} ({self.user.username})"
+
+
+class AudioProgress(models.Model):
+    """Track user progress on audio files"""
+    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='audio_progress')
+    audio = models.ForeignKey(Audio, on_delete=models.CASCADE, related_name='user_progress')
+    position = models.IntegerField(default=0, help_text="Current position in seconds")
+    completed = models.BooleanField(default=False)
+    last_updated = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        unique_together = ('user', 'audio')
+        indexes = [
+            models.Index(fields=['user', 'audio']),
+        ]
+
+    def __str__(self):
+        return f"{self.user.username} - {self.audio.title}"