2fd2cdca71
Migrates receiptwitness to a standalone repo with inlined common models. Includes SQLite test compatibility fixes (server_default stripping for gen_random_bytes, relationship stubs for SQLAlchemy mapper). QA PASS (cartsnitch-qa): lint ✅ test ✅ 306/306 passed. Co-Authored-By: Paperclip <noreply@paperclip.ing>