Migrate SEGW OData V2 service ➜ RAP service

Reverse-engineer a classic SEGW-built OData V2 service (MPC/DPC/MPC_EXT/DPC_EXT) into a modern RAP service (CDS root + projection + BDEF + SRVD + SRVB + behavior pool) on the same SAP system. Runs side-by-side: the legacy service stays live; the new RAP service lands in a separate, resettable package.

Domain example. Templates in this skill use an illustrative Project → Tasks → TimeEntries domain (entity names like ZR_DM_PROJECT, ZBP_DM_PROJECT, ZDM_PROJECT_D) so the shape is concrete. Substitute the user's entities throughout — the LLM running this skill should rewrite every entity identifier to match the source service.

Smart defaults (apply silently — do NOT ask before research)