feat: update database schema to support item trading

src/db/schema.ts

@@ -72,12 +72,28 @@ export const transactions = pgTable('transactions', {
     id: bigserial('id', { mode: 'bigint' }).primaryKey(),
     userId: bigint('user_id', { mode: 'bigint' })
         .references(() => users.id, { onDelete: 'cascade' }),
+    relatedUserId: bigint('related_user_id', { mode: 'bigint' })
+        .references(() => users.id, { onDelete: 'set null' }),
     amount: bigint('amount', { mode: 'bigint' }).notNull(),
     type: varchar('type', { length: 50 }).notNull(),
     description: text('description'),
     createdAt: timestamp('created_at', { withTimezone: true }).defaultNow(),
 });
 
+export const itemTransactions = pgTable('item_transactions', {
+    id: bigserial('id', { mode: 'bigint' }).primaryKey(),
+    userId: bigint('user_id', { mode: 'bigint' })
+        .references(() => users.id, { onDelete: 'cascade' }).notNull(),
+    relatedUserId: bigint('related_user_id', { mode: 'bigint' })
+        .references(() => users.id, { onDelete: 'set null' }), // who they got it from/gave it to
+    itemId: integer('item_id')
+        .references(() => items.id, { onDelete: 'cascade' }).notNull(),
+    quantity: bigint('quantity', { mode: 'bigint' }).notNull(), // positive = gain, negative = loss
+    type: varchar('type', { length: 50 }).notNull(), // e.g., 'TRADE', 'SHOP_BUY', 'DROP'
+    description: text('description'),
+    createdAt: timestamp('created_at', { withTimezone: true }).defaultNow(),
+});
+
 // 6. Quests
 export const quests = pgTable('quests', {
     id: serial('id').primaryKey(),
@@ -169,4 +185,19 @@ export const cooldownsRelations = relations(cooldowns, ({ one }) => ({
         fields: [cooldowns.userId],
         references: [users.id],
     }),
+}));
+
+export const itemTransactionsRelations = relations(itemTransactions, ({ one }) => ({
+    user: one(users, {
+        fields: [itemTransactions.userId],
+        references: [users.id],
+    }),
+    relatedUser: one(users, {
+        fields: [itemTransactions.relatedUserId],
+        references: [users.id],
+    }),
+    item: one(items, {
+        fields: [itemTransactions.itemId],
+        references: [items.id],
+    }),
 }));

src/graphics/studentID.ts

@@ -29,7 +29,6 @@ export async function generateStudentIdCard(data: StudentCardData): Promise<Buff
 
     // Draw Background Gradient with random hue
     const gradient = ctx.createLinearGradient(0, 0, canvas.width, canvas.height);
-    const hue = Math.random() * 360;
     const saturation = 40 + Math.random() * 20; // 40-60%
     const lightness = 20 + Math.random() * 20; // 20-40%
     const color2 = `hsl(${Math.random() * 360}, ${saturation}%, ${lightness}%)`;