feat: Add Extraction model and seed main playlist functionality

app/models/extraction.py

@@ -0,0 +1,39 @@
+from typing import TYPE_CHECKING
+
+from sqlmodel import Field, Relationship, UniqueConstraint
+
+from app.models.base import BaseModel
+
+if TYPE_CHECKING:
+    from app.models.sound import Sound
+    from app.models.user import User
+
+
+class Extraction(BaseModel, table=True):
+    """Database model for a stream."""
+
+    service: str = Field(nullable=False)
+    service_id: str = Field(nullable=False)
+    user_id: int = Field(foreign_key="user.id", nullable=False)
+    sound_id: int | None = Field(foreign_key="sound.id", default=None)
+    url: str = Field(nullable=False)
+    title: str | None = Field(default=None)
+    track: str | None = Field(default=None)
+    artist: str | None = Field(default=None)
+    album: str | None = Field(default=None)
+    genre: str | None = Field(default=None)
+    status: str = Field(nullable=False, default="pending")
+    error: str | None = Field(default=None)
+
+    # constraints
+    __table_args__ = (
+        UniqueConstraint(
+            "service",
+            "service_id",
+            name="uq_extraction_service_service_id",
+        ),
+    )
+
+    # relationships
+    sound: "Sound" = Relationship(back_populates="extractions")
+    user: "User" = Relationship(back_populates="extractions")