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petfeed/.claude/rules/ecc/python/patterns.md
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adminandClaude Sonnet 5 f14be58c06 feat: engagement-counter denormalization, pagination fixes, dead-code cleanup
Bundles the 2026-07-12 code-audit session (Clusters A/B/C/D partial/E/F):
denormalized Post/Advertisement reaction/comment/repost counters synced
transactionally instead of live _count queries; real cursor-based pagination
for followers/following/blocks lists; assertPetOwnership + formatRelativeTime
centralized; dead r2.ts + AWS SDK deps removed; missing DB indexes added;
account-deletion flow, mention notifications, pull-to-refresh feed, and
mobile UI/i18n fixes from the surrounding sessions.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-07-16 19:22:23 +02:00

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Markdown

---
paths:
- "**/*.py"
- "**/*.pyi"
---
# Python Patterns
> This file extends [common/patterns.md](../common/patterns.md) with Python specific content.
## Protocol (Duck Typing)
```python
from typing import Protocol
class Repository(Protocol):
def find_by_id(self, id: str) -> dict | None: ...
def save(self, entity: dict) -> dict: ...
```
## Dataclasses as DTOs
```python
from dataclasses import dataclass
@dataclass
class CreateUserRequest:
name: str
email: str
age: int | None = None
```
## Context Managers & Generators
- Use context managers (`with` statement) for resource management
- Use generators for lazy evaluation and memory-efficient iteration
## Reference
See skill: `python-patterns` for comprehensive patterns including decorators, concurrency, and package organization.