post3/todos/POST3-003-repository-layer.md

POST3-003: Repository layer and Store API

Status: Done Priority: P0 Blocked by: POST3-002

Description

Implement the repository layer (raw SQL CRUD for each table) and the high-level Store API that orchestrates them with transactions and chunking logic.

Acceptance Criteria

• repositories/buckets.rs — create, get_by_name, list, delete, is_empty
• repositories/objects.rs — upsert, get, delete, list (with prefix + pagination)
• repositories/blocks.rs — insert_block, get_all_blocks (ordered by block_index)
• repositories/metadata.rs — insert_batch, get_all (for an object_id)
• store.rs — Store struct with all public methods:
  • create_bucket, head_bucket, delete_bucket, list_buckets
  • put_object (chunking + MD5 ETag + metadata, all in a transaction)
  • get_object (reassemble blocks + fetch metadata)
  • head_object, delete_object, list_objects_v2
  • get_object_metadata
• put_object correctly splits body into 1 MiB blocks
• get_object correctly reassembles blocks in order
• Overwriting an object deletes old blocks+metadata via CASCADE
• cargo check -p post3 passes