feature/boss-sprites-and-badges (#22)

Reviewed-on: TheFurya/nuzlocke-tracker#22
Co-authored-by: Julian Tabel <juliantabel.jt@gmail.com>
Co-committed-by: Julian Tabel <juliantabel.jt@gmail.com>

backend/src/app/alembic/versions/f7a8b9c0d1e2_add_game_id_to_boss_battles.py

@@ -0,0 +1,76 @@
+"""add game_id to boss battles
+
+Revision ID: f7a8b9c0d1e2
+Revises: e5f70a1ca323
+Create Date: 2026-02-14 12:00:00.000000
+
+"""
+
+from collections.abc import Sequence
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "f7a8b9c0d1e2"
+down_revision: str | Sequence[str] | None = "e5f70a1ca323"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "boss_battles",
+        sa.Column("game_id", sa.Integer(), nullable=True),
+    )
+    op.create_foreign_key(
+        "fk_boss_battles_game_id",
+        "boss_battles",
+        "games",
+        ["game_id"],
+        ["id"],
+    )
+    op.create_index("ix_boss_battles_game_id", "boss_battles", ["game_id"])
+
+    # Data migration: for bosses where section is a game name,
+    # look up the game ID, set game_id, and reset section to null.
+    conn = op.get_bind()
+    rows = conn.execute(
+        sa.text(
+            "SELECT bb.id, g.id AS gid "
+            "FROM boss_battles bb "
+            "JOIN games g ON LOWER(bb.section) = LOWER(g.name) "
+            "WHERE bb.section IS NOT NULL"
+        )
+    ).fetchall()
+    for row in rows:
+        conn.execute(
+            sa.text(
+                "UPDATE boss_battles SET game_id = :gid, section = NULL WHERE id = :bid"
+            ),
+            {"gid": row.gid, "bid": row.id},
+        )
+
+
+def downgrade() -> None:
+    # Reverse data migration: restore section from game name
+    conn = op.get_bind()
+    rows = conn.execute(
+        sa.text(
+            "SELECT bb.id, g.name "
+            "FROM boss_battles bb "
+            "JOIN games g ON bb.game_id = g.id "
+            "WHERE bb.game_id IS NOT NULL"
+        )
+    ).fetchall()
+    for row in rows:
+        conn.execute(
+            sa.text(
+                "UPDATE boss_battles SET section = :name, game_id = NULL WHERE id = :bid"
+            ),
+            {"name": row.name, "bid": row.id},
+        )
+
+    op.drop_index("ix_boss_battles_game_id", table_name="boss_battles")
+    op.drop_constraint("fk_boss_battles_game_id", "boss_battles", type_="foreignkey")
+    op.drop_column("boss_battles", "game_id")