Task Breakdown for an Inventory Management API

Problem/Feature Description

A logistics company is building a REST API to manage warehouse inventory. The team has completed the feature spec and technical plan and now needs a task list that developers can work from.

Output Specification

Produce a tasks.md file organized into clear phases with all required metadata. Include a brief tasks-report.md summarizing the total task count, number of parallelizable tasks, and the phase structure used.

Input Files

The following files are provided as inputs. Extract them before beginning.

=============== FILE: specs/002-inventory/spec.md ===============

Feature Specification: Inventory Management API

User Stories

US-1: Add Inventory Item (Priority: P1)

As a warehouse manager, I want to add new items to the inventory so the system tracks what we have in stock.

Functional Requirements:

• FR-001: Items must have a SKU, name, quantity, and unit price.
• FR-002: SKUs must be unique across the inventory.
• FR-003: Item creation must be logged with a timestamp and user ID.

Acceptance Scenarios:

1. Given a warehouse manager, When they submit a valid new item, Then the item is saved and a 201 response is returned.
2. Given a duplicate SKU, When item creation is attempted, Then a 409 error is returned.

Success Criteria:

• SC-001: Item creation completes in under 200ms for 99% of requests.
• SC-002: All item creation events are logged with timestamp and user ID.

US-2: Update Stock Quantity (Priority: P1)

As a warehouse worker, I want to update the quantity of an existing item so the system reflects current stock levels.

Functional Requirements:

• FR-004: Quantity updates must support absolute set and relative delta operations.
• FR-005: Quantity cannot be set below 0.
• FR-006: All quantity changes must be logged with before/after values.

Acceptance Scenarios:

1. Given an existing item, When quantity is updated to 50, Then quantity is 50 and a 200 response is returned.
2. Given an item with quantity 10, When a delta of -20 is applied, Then a 400 error is returned (negative stock not allowed).
3. Given a quantity update, When it succeeds, Then the change is logged with before and after values.

Success Criteria:

• SC-003: Quantity updates are idempotent when using absolute set operations.
• SC-004: Zero tolerance for quantity going below 0.

US-3: Search Inventory (Priority: P2)

As a logistics analyst, I want to search inventory by SKU, name, or category so I can find items quickly.

Functional Requirements:

• FR-007: Search must support partial match on name and exact match on SKU.
• FR-008: Results must be paginated with a maximum of 50 items per page.

Acceptance Scenarios:

1. Given inventory with 200 items, When a search for name containing "bolt" is submitted, Then matching items are returned paginated.
2. Given a specific SKU, When an exact search is submitted, Then only that item is returned.

Success Criteria:

• SC-005: Search returns results in under 500ms for collections up to 100,000 items.

=============== FILE: specs/002-inventory/plan.md ===============

Technical Plan: Inventory Management API

Technical Context

• Language/Version: Python 3.11
• Primary Framework: FastAPI 0.104
• Storage: PostgreSQL 15 with SQLAlchemy 2.0 ORM
• Testing: pytest with pytest-asyncio, httpx for test client
• Package Manager: pip with pyproject.toml
• Target Platform: Linux/Docker

Project Structure

src/
  models/item.py          # SQLAlchemy Item model
  schemas/item.py         # Pydantic request/response schemas
  services/inventory.py   # Business logic
  routers/inventory.py    # FastAPI route handlers
  database.py             # DB connection and session management
tests/
  features/               # BDD .feature files (already generated)
    add_item.feature
    update_quantity.feature
    search_inventory.feature
  step_definitions/       # To be created
  conftest.py             # Test fixtures
pyproject.toml

Test Spec IDs

The following test spec IDs from the .feature files map to user stories:

• US-1 scenarios: TS-001, TS-002
• US-2 scenarios: TS-003, TS-004, TS-005
• US-3 scenarios: TS-006, TS-007