feat(worldBuilder): implement floor objects, multi-tile structures and door collision states (#9)

api/schema.sql

@@ -650,5 +650,43 @@ CREATE TABLE IF NOT EXISTS game_map_tile_entities (
 
 CREATE INDEX IF NOT EXISTS idx_game_map_tile_entities_map
     ON game_map_tile_entities(map_num, status);
+
+-- Floor objects carry objIndex + amount and therefore cannot be represented
+-- as graphic layers without losing gameplay data.
+CREATE TABLE IF NOT EXISTS game_map_object_overrides (
+    map_num INTEGER NOT NULL CHECK (map_num > 0),
+    x INTEGER NOT NULL CHECK (x BETWEEN 1 AND 100),
+    y INTEGER NOT NULL CHECK (y BETWEEN 1 AND 100),
+    obj_index INTEGER NOT NULL REFERENCES game_objects(id) ON DELETE RESTRICT,
+    amount INTEGER NOT NULL DEFAULT 1 CHECK (amount BETWEEN 1 AND 10000),
+    updated_by_account_id UUID REFERENCES accounts(id) ON DELETE SET NULL,
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    status TEXT NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'published')),
+    PRIMARY KEY (map_num, x, y, status)
+);
+
+CREATE INDEX IF NOT EXISTS idx_game_map_object_overrides_map
+    ON game_map_object_overrides(map_num, status);
+
+-- Doors keep visual and collision state separately from structure layers so
+-- neither feature can silently overwrite the other.
+CREATE TABLE IF NOT EXISTS game_map_door_overrides (
+    map_num INTEGER NOT NULL CHECK (map_num > 0),
+    x INTEGER NOT NULL CHECK (x BETWEEN 1 AND 100),
+    y INTEGER NOT NULL CHECK (y BETWEEN 1 AND 100),
+    open_grh_index INTEGER NOT NULL CHECK (open_grh_index > 0),
+    closed_grh_index INTEGER NOT NULL CHECK (closed_grh_index > 0),
+    is_open BOOLEAN NOT NULL,
+    blocked BOOLEAN NOT NULL,
+    updated_by_account_id UUID REFERENCES accounts(id) ON DELETE SET NULL,
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    status TEXT NOT NULL DEFAULT 'draft' CHECK (status IN ('draft', 'published')),
+    CHECK (blocked = (NOT is_open)),
+    PRIMARY KEY (map_num, x, y, status)
+);
+
+CREATE INDEX IF NOT EXISTS idx_game_map_door_overrides_map
+    ON game_map_door_overrides(map_num, status);
+
 CREATE INDEX IF NOT EXISTS idx_game_uploaded_graphics_created_at
     ON game_uploaded_graphics(created_at DESC);