feature: round robin (#84)

Author: lukepolo

UNUSED_FUNCTIONS_ANALYSIS.md

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+# Function Usage Analysis
+
+## Summary
+All tournament functions appear to be **USED**. No unused functions found.
+
+## Function Usage Details
+
+### ✅ All Functions Are Used
+
+#### Core Tournament Functions
+- `advance_round_robin_teams` - Used in `update_tournament_bracket.sql`
+- `advance_byes_for_tournament` - Used in `seed_stage.sql`
+- `assign_seeds_to_teams` - Used in `triggers/tournaments.sql`
+- `assign_team_to_bracket_slot` - Used in `update_tournament_bracket.sql` and `schedule_tournament_match.sql`
+- `check_round_robin_stage_complete` - Used in `update_tournament_bracket.sql`
+- `check_team_eligibility` - Used in `triggers/tournament_team_roster.sql`
+- `check_tournament_finished` - Used in `update_tournament_bracket.sql`
+- `create_round_robin_matches` - Used in `update_tournament_stages.sql`
+- `delete_tournament_brackets_and_matches` - Used in `triggers/tournaments.sql` and `update_tournament_stages.sql`
+- `generate_bracket_order` - Used in `update_tournament_stages.sql`
+- `get_stage_team_counts` - Used in `update_tournament_stages.sql`
+- `get_team_next_round_bracket_id` - Used in `schedule_next_round_robin_matches.sql`
+- `is_tournament_match` - Used in `triggers/matches.sql` and Hasura metadata
+- `is_tournament_organizer` - Used in Hasura metadata (computed field)
+- `link_round_group_matches` - Used in `link_tournament_stage_matches.sql`
+- `link_stage_brackets` - Used in `link_tournament_stages.sql`
+- `link_tournament_stage_matches` - Used in `update_tournament_stages.sql`
+- `link_tournament_stages` - Used in `update_tournament_stages.sql`
+- `opponent_finished_previous_round` - Used in `schedule_next_round_robin_matches.sql`
+- `schedule_next_round_robin_matches` - Used in `update_tournament_bracket.sql`
+- `schedule_tournament_match` - Used in `update_tournament_bracket.sql` and `schedule_next_round_robin_matches.sql`
+- `seed_stage` - Used in `advance_round_robin_teams.sql`
+- `tournament_bracket_eta` - Used as computed field in Hasura metadata
+- `tournament_has_min_teams` - Used in `can_start_tournament.sql`, `can_close_tournament_registration.sql`, `triggers/tournaments.sql`, and Hasura metadata
+- `tournament_max_players_per_lineup` - Used in `check_team_eligibility.sql` and Hasura metadata
+- `tournament_min_players_per_lineup` - Used in `check_team_eligibility.sql` and Hasura metadata
+- `update_tournament_bracket` - Used in `triggers/matches.sql`
+- `update_tournament_stages` - Used in `triggers/tournaments.sql`
+- `calculate_tournament_bracket_start_times` - Used in `update_tournament_stages.sql` and `schedule_tournament_match.sql`
+
+#### Permission Functions (All Used in Hasura Metadata)
+- `can_cancel_tournament` - Used in `triggers/tournaments.sql` and Hasura metadata
+- `can_close_tournament_registration` - Used in `triggers/tournaments.sql` and Hasura metadata
+- `can_join_tournament` - Used in Hasura metadata
+- `can_open_tournament_registration` - Used in `triggers/tournaments.sql` and Hasura metadata
+- `can_start_tournament` - Used in Hasura metadata
+
+## Notes
+- All functions are either:
+  1. Called by other functions/triggers
+  2. Used as computed fields in Hasura GraphQL schema
+  3. Used in permission checks via triggers
+
+- No orphaned or unused functions detected in the tournaments directory.
+
+