diff --git a/internal/audiobooks/abs/collections.go b/internal/audiobooks/abs/collections.go
index 2eb3ab4c..c22d3d0c 100644
--- a/internal/audiobooks/abs/collections.go
+++ b/internal/audiobooks/abs/collections.go
@@ -5,10 +5,11 @@ import (
 	"time"
 )
 
-// CollectionStore is the narrow slice of the abs_user_collections +
-// abs_collection_items tables the collections handlers need.
-// Implemented by ABSCollectionStore in
-// internal/audiobooks/abs_collection_store.go.
+// CollectionStore is the narrow slice of user_personal_collections
+// (collection_type='manual') and user_personal_collection_items
+// (sub_item_id='') the collections handlers need. Implemented by
+// ABSCollectionStore in internal/audiobooks/abs_collection_store.go;
+// post-migration-156 it reads the unified canonical tables.
 type CollectionStore interface {
 	// ListUserCollections returns collections owned by (userID, profileID),
 	// ordered by created_at DESC. Empty slice (never nil) when none.
@@ -22,7 +23,8 @@ type CollectionStore interface {
 	// updated_at = now(). Owner check is the caller's responsibility.
 	UpdateCollection(ctx context.Context, c Collection) error
 	// DeleteCollection removes the collection and (via FK CASCADE) all
-	// its abs_collection_items. Returns nil even if no row matched.
+	// its user_personal_collection_items. Returns nil even if no row
+	// matched.
 	DeleteCollection(ctx context.Context, id string) error
 	// ListCollectionItems returns items ordered by added_at ASC.
 	// Empty slice (never nil) when none.
@@ -36,8 +38,8 @@ type CollectionStore interface {
 	RemoveCollectionItem(ctx context.Context, collectionID, libraryItemID string) error
 }
 
-// Collection is the in-memory representation of an
-// abs_user_collections row.
+// Collection is the in-memory representation of a
+// user_personal_collections row with collection_type='manual'.
 type Collection struct {
 	ID          string
 	UserID      string
@@ -49,8 +51,9 @@ type Collection struct {
 	UpdatedAt   time.Time
 }
 
-// CollectionItem is the in-memory representation of an
-// abs_collection_items row.
+// CollectionItem is the in-memory representation of a
+// user_personal_collection_items row scoped to a manual collection
+// (sub_item_id='').
 type CollectionItem struct {
 	CollectionID  string
 	LibraryItemID string
diff --git a/internal/audiobooks/abs/collections_handler.go b/internal/audiobooks/abs/collections_handler.go
index 77b6f5f4..ec841d63 100644
--- a/internal/audiobooks/abs/collections_handler.go
+++ b/internal/audiobooks/abs/collections_handler.go
@@ -386,7 +386,7 @@ func (h *Handler) handleRemoveCollectionBook(w http.ResponseWriter, r *http.Requ
 }
 
 // handleDeleteCollection — DELETE /collections/{id}.
-// Owner-only. Cascade drops abs_collection_items via FK CASCADE.
+// Owner-only. Cascade drops user_personal_collection_items via FK CASCADE.
 // 204 on success; 404 for unknown or non-owned.
 func (h *Handler) handleDeleteCollection(w http.ResponseWriter, r *http.Request) {
 	a, ok := absAuthFrom(r)
diff --git a/internal/audiobooks/abs/handler.go b/internal/audiobooks/abs/handler.go
index 1e364068..7ee12478 100644
--- a/internal/audiobooks/abs/handler.go
+++ b/internal/audiobooks/abs/handler.go
@@ -227,8 +227,10 @@ type Dependencies struct {
 	// PlaylistStore persists ABS playlist rows (migrations 151 + 152).
 	// May be nil; handlers respond 503 when unset.
 	PlaylistStore PlaylistStore
-	// SmartCollectionStore persists abs_smart_collections rows
-	// (migration 153). May be nil; handlers respond 503 when unset.
+	// SmartCollectionStore persists user_personal_collections rows with
+	// collection_type='smart' (migration 156 unified the old
+	// abs_smart_collections table into the canonical store).
+	// May be nil; handlers respond 503 when unset.
 	SmartCollectionStore SmartCollectionStore
 	// RSSFeedStore persists abs_rss_feeds rows (migration 155).
 	// May be nil; handlers respond 503 when unset.
diff --git a/internal/audiobooks/abs/playlists.go b/internal/audiobooks/abs/playlists.go
index 84b50d2f..aa0794df 100644
--- a/internal/audiobooks/abs/playlists.go
+++ b/internal/audiobooks/abs/playlists.go
@@ -5,9 +5,11 @@ import (
 	"time"
 )
 
-// PlaylistStore is the narrow slice of abs_playlists + abs_playlist_items
-// the playlists handlers need. Implemented by ABSPlaylistStore in
-// internal/audiobooks/abs_playlist_store.go.
+// PlaylistStore is the narrow slice of user_personal_collections
+// (collection_type='playlist') and user_personal_collection_items the
+// playlists handlers need. Implemented by ABSPlaylistStore in
+// internal/audiobooks/abs_playlist_store.go; post-migration-156 it reads
+// the unified canonical tables.
 type PlaylistStore interface {
 	ListUserPlaylists(ctx context.Context, userID, profileID string) ([]Playlist, error)
 	GetPlaylist(ctx context.Context, id string) (Playlist, error)
@@ -19,7 +21,8 @@ type PlaylistStore interface {
 	RemovePlaylistItem(ctx context.Context, playlistID, libraryItemID, episodeID string) error
 }
 
-// Playlist is the in-memory representation of an abs_playlists row.
+// Playlist is the in-memory representation of a user_personal_collections
+// row with collection_type='playlist'.
 type Playlist struct {
 	ID          string
 	UserID      string
@@ -32,7 +35,9 @@ type Playlist struct {
 	UpdatedAt   time.Time
 }
 
-// PlaylistItem is the in-memory representation of an abs_playlist_items row.
+// PlaylistItem is the in-memory representation of a
+// user_personal_collection_items row scoped to a playlist (sub_item_id
+// may be non-empty for podcast-episode entries).
 type PlaylistItem struct {
 	PlaylistID    string
 	LibraryItemID string
diff --git a/internal/audiobooks/abs/playlists_handler.go b/internal/audiobooks/abs/playlists_handler.go
index 9d313684..354afe8f 100644
--- a/internal/audiobooks/abs/playlists_handler.go
+++ b/internal/audiobooks/abs/playlists_handler.go
@@ -374,7 +374,7 @@ func (h *Handler) handleAddPlaylistItem(w http.ResponseWriter, r *http.Request)
 }
 
 // handleDeletePlaylist — DELETE /playlists/{id}.
-// Owner-only. Cascade drops abs_playlist_items via FK.
+// Owner-only. Cascade drops user_personal_collection_items via FK.
 // Fires playlist_removed.
 func (h *Handler) handleDeletePlaylist(w http.ResponseWriter, r *http.Request) {
 	a, ok := absAuthFrom(r)
diff --git a/internal/audiobooks/abs/smart_collections.go b/internal/audiobooks/abs/smart_collections.go
index efc70dbc..9ab8dc7a 100644
--- a/internal/audiobooks/abs/smart_collections.go
+++ b/internal/audiobooks/abs/smart_collections.go
@@ -6,8 +6,10 @@ import (
 	"time"
 )
 
-// SmartCollectionStore is the narrow slice of abs_smart_collections
-// the handlers need.
+// SmartCollectionStore is the narrow slice of user_personal_collections
+// (collection_type='smart') the handlers need. Post-migration-156 smart
+// collections share the unified canonical table; membership is computed
+// at request time via the smartcoll package (no items table).
 type SmartCollectionStore interface {
 	ListUserSmartCollections(ctx context.Context, userID, profileID string) ([]SmartCollection, error)
 	GetSmartCollection(ctx context.Context, id string) (SmartCollection, error)
@@ -16,9 +18,10 @@ type SmartCollectionStore interface {
 	DeleteSmartCollection(ctx context.Context, id string) error
 }
 
-// SmartCollection mirrors an abs_smart_collections row. QueryDef holds
-// the raw JSONB bytes (decoded only on the /items route where rules
-// are evaluated).
+// SmartCollection mirrors a user_personal_collections row with
+// collection_type='smart'. QueryDef holds the raw JSONB bytes from
+// query_definition (decoded only on the /items route where rules are
+// evaluated).
 type SmartCollection struct {
 	ID          string
 	UserID      string