## ADDED Requirements

### Requirement: User can record categorized expenses
The system SHALL allow the user to create an expense with a title, amount, category, and local calendar date using fixed starter categories.

#### Scenario: Valid expense is created
- **WHEN** the user submits a title, positive amount, valid category, and valid local date
- **THEN** the system stores the expense and returns the created record

#### Scenario: Invalid expense is rejected
- **WHEN** the user submits a missing title, invalid amount, invalid category, or invalid date
- **THEN** the system rejects the request with a validation error and does not store the expense

### Requirement: User can review and delete expenses
The system SHALL allow the user to list recorded expenses and delete a specific expense by identifier.

#### Scenario: Expenses are listed
- **WHEN** the user requests expenses for the app
- **THEN** the system returns stored expenses in a stable order with their recorded fields

### Requirement: User can browse expense history by month
The system SHALL allow the user to select a `YYYY-MM` month when reviewing expense history and SHALL return the expenses recorded for that month.

#### Scenario: Prior month entries are visible
- **WHEN** the user selects February 2026 in the add-expense history view
- **THEN** the system shows the expenses recorded in February 2026 and exposes delete actions for deletable entries in that month

#### Scenario: Expense is deleted
- **WHEN** the user deletes an existing expense
- **THEN** the system removes that expense and it no longer appears in future listings or aggregates