diff --git a/src/haunt_fm/models/track.py b/src/haunt_fm/models/track.py
index 5789cec..b64e576 100644
--- a/src/haunt_fm/models/track.py
+++ b/src/haunt_fm/models/track.py
@@ -1,7 +1,7 @@
 from datetime import datetime
 
 from pgvector.sqlalchemy import Vector
-from sqlalchemy import REAL, BigInteger, DateTime, Index, Integer, Text, func
+from sqlalchemy import REAL, BigInteger, DateTime, ForeignKey, Index, Integer, Text, func
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
@@ -37,7 +37,7 @@ class ListenEvent(Base):
     __tablename__ = "listen_events"
 
     id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
-    track_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    track_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("tracks.id"), nullable=False)
     source: Mapped[str] = mapped_column(Text, nullable=False, default="music_assistant")
     speaker_name: Mapped[str | None] = mapped_column(Text)
     listened_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
@@ -51,7 +51,7 @@ class TrackEmbedding(Base):
     __tablename__ = "track_embeddings"
 
     id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
-    track_id: Mapped[int] = mapped_column(BigInteger, unique=True, nullable=False)
+    track_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("tracks.id"), unique=True, nullable=False)
     embedding = mapped_column(Vector(512), nullable=False)
     model_version: Mapped[str] = mapped_column(Text, nullable=False, default="laion/larger_clap_music")
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
@@ -67,8 +67,8 @@ class SimilarityLink(Base):
     __tablename__ = "similarity_links"
 
     id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
-    source_track_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
-    target_track_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    source_track_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("tracks.id"), nullable=False)
+    target_track_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("tracks.id"), nullable=False)
     lastfm_match: Mapped[float | None] = mapped_column(REAL)
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
 
@@ -103,8 +103,8 @@ class PlaylistTrack(Base):
     __tablename__ = "playlist_tracks"
 
     id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
-    playlist_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
-    track_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    playlist_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("playlists.id", ondelete="CASCADE"), nullable=False)
+    track_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("tracks.id"), nullable=False)
     position: Mapped[int] = mapped_column(Integer, nullable=False)
     is_known: Mapped[bool] = mapped_column(nullable=False)
     similarity_score: Mapped[float | None] = mapped_column(REAL)