add expenses management

internal/model/expense.go

@@ -0,0 +1,39 @@
+package model
+
+import "time"
+
+type ExpenseType string
+
+const (
+	ExpenseTypeExpense ExpenseType = "expense"
+	ExpenseTypeTopup   ExpenseType = "topup"
+)
+
+type Expense struct {
+	ID          string      `db:"id"`
+	SpaceID     string      `db:"space_id"`
+	CreatedBy   string      `db:"created_by"`
+	Description string      `db:"description"`
+	AmountCents int         `db:"amount_cents"`
+	Type        ExpenseType `db:"type"`
+	Date        time.Time   `db:"date"`
+	CreatedAt   time.Time   `db:"created_at"`
+	UpdatedAt   time.Time   `db:"updated_at"`
+}
+
+type ExpenseTag struct {
+	ExpenseID string `db:"expense_id"`
+	TagID     string `db:"tag_id"`
+}
+
+type ExpenseItem struct {
+	ExpenseID string `db:"expense_id"`
+	ItemID    string `db:"item_id"`
+}
+
+type TagExpenseSummary struct {
+	TagID       string `db:"tag_id"`
+	TagName     string `db:"tag_name"`
+	TagColor    string `db:"tag_color"`
+	TotalAmount int    `db:"total_amount"`
+}