feat(backend): Add external link fields to schemas and migration script

backend/add_link_columns.py

@@ -0,0 +1,35 @@
+import os
+from sqlmodel import create_engine, text
+
+# Get DB URL from env or default (adjust for production)
+DATABASE_URL = os.environ.get("DATABASE_URL", "postgresql://elmeg:runfoo@localhost/elmeg")
+
+engine = create_engine(DATABASE_URL)
+
+def run_migration():
+    with engine.connect() as conn:
+        print("Adding columns to Show table...")
+        try:
+            conn.execute(text("ALTER TABLE show ADD COLUMN bandcamp_link VARCHAR"))
+            print("Added bandcamp_link")
+        except Exception as e:
+            print(f"Skipping bandcamp_link (already exists?)")
+
+        try:
+            conn.execute(text("ALTER TABLE show ADD COLUMN nugs_link VARCHAR"))
+            print("Added nugs_link")
+        except Exception as e:
+            print(f"Skipping nugs_link (already exists?)")
+
+        print("Adding columns to Performance table...")
+        try:
+            conn.execute(text("ALTER TABLE performance ADD COLUMN track_url VARCHAR"))
+            print("Added track_url")
+        except Exception as e:
+             print(f"Skipping track_url (already exists?)")
+        
+        conn.commit()
+    print("Migration complete.")
+
+if __name__ == "__main__":
+    run_migration()

backend/models.py

@@ -12,6 +12,7 @@ class Performance(SQLModel, table=True):
     set_name: Optional[str] = Field(default=None, description="e.g., Set 1, Encore")
     segue: bool = Field(default=False, description="Transition to next song >")
     notes: Optional[str] = Field(default=None)
+    track_url: Optional[str] = Field(default=None, description="Deep link to track audio")
     
     nicknames: List["PerformanceNickname"] = Relationship(back_populates="performance")
     show: "Show" = Relationship(back_populates="performances")
@@ -93,6 +94,10 @@ class Show(SQLModel, table=True):
     tour_id: Optional[int] = Field(default=None, foreign_key="tour.id")
     notes: Optional[str] = Field(default=None)
     
+    # External Links
+    bandcamp_link: Optional[str] = Field(default=None)
+    nugs_link: Optional[str] = Field(default=None)
+    
     vertical: Vertical = Relationship(back_populates="shows")
     venue: Optional[Venue] = Relationship(back_populates="shows")
     tour: Optional[Tour] = Relationship(back_populates="shows")