Add Tiers and Game Prize

migrations/000052_create_game_prizes_table.up.sql

@@ -0,0 +1,45 @@
+CREATE TABLE game_prizes (
+    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    game_id UUID NOT NULL,
+    name VARCHAR(255) NOT NULL,
+    weight INTEGER NOT NULL,
+    stock INTEGER DEFAULT 0,
+    max_stock INTEGER,
+    threshold BIGINT,
+    fallback_prize_id UUID,
+    metadata JSONB DEFAULT '{}',
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW(),
+    
+    CONSTRAINT fk_game_prizes_game
+        FOREIGN KEY (game_id)
+        REFERENCES games(id)
+        ON DELETE CASCADE,
+    
+    CONSTRAINT fk_game_prizes_fallback
+        FOREIGN KEY (fallback_prize_id)
+        REFERENCES game_prizes(id)
+        ON DELETE SET NULL,
+    
+    CONSTRAINT chk_game_prizes_weight_positive
+        CHECK (weight > 0),
+    
+    CONSTRAINT chk_game_prizes_stock_non_negative
+        CHECK (stock >= 0),
+    
+    CONSTRAINT chk_game_prizes_max_stock_positive
+        CHECK (max_stock IS NULL OR max_stock > 0),
+    
+    CONSTRAINT chk_game_prizes_threshold_non_negative
+        CHECK (threshold IS NULL OR threshold >= 0),
+    
+    CONSTRAINT chk_game_prizes_stock_not_exceed_max
+        CHECK (max_stock IS NULL OR stock <= max_stock)
+);
+
+-- Create indexes
+CREATE INDEX idx_game_prizes_game_id ON game_prizes(game_id);
+CREATE INDEX idx_game_prizes_weight ON game_prizes(weight);
+CREATE INDEX idx_game_prizes_stock ON game_prizes(stock);
+CREATE INDEX idx_game_prizes_fallback_prize_id ON game_prizes(fallback_prize_id);
+CREATE INDEX idx_game_prizes_created_at ON game_prizes(created_at);