Function removePlayerFromTeam

removePlayerFromTeam(playerId: string, teamId: string): Promise<void>
Remove playerId from team.playerIds AND teamId from player.teamIds in a single atomic transaction.

Safe to call when the relationship does not exist — idempotent.
Parameters
- playerId: string
- teamId: string
Returns Promise<void>
- Defined in src/db/players-teams.ts:47