fix: implement MySQL scheduler methods

[kaiisfree]

Summary

• Implements all 12 missing scheduler methods in MySQLDb and AsyncMySQLDb backends
• Adds schedules and schedule_runs table schema definitions for MySQL
• Fixes [Bug] MySQLDb in Agno 2.5.10 does not implement Scheduler methods (claim_due_schedule, etc.) #7238

Changes

libs/agno/agno/db/mysql/schemas.py

• Added SCHEDULE_TABLE_SCHEMA with MySQL-compatible types (JSON, VARCHAR with explicit lengths)
• Added _get_schedule_runs_table_schema() with FK reference to schedules table
• Updated get_table_schema_definition() to handle new table types

libs/agno/agno/db/mysql/mysql.py (sync)

• Added schedules and schedule_runs to _get_table()
• Implemented: get_schedule, get_schedule_by_name, get_schedules, create_schedule, update_schedule, delete_schedule, claim_due_schedule, release_schedule, create_schedule_run, update_schedule_run, get_schedule_run, get_schedule_runs

libs/agno/agno/db/mysql/async_mysql.py (async)

• Same 12 methods as async variants

MySQL-specific adaptations

• claim_due_schedule: Uses SELECT...FOR UPDATE SKIP LOCKED + UPDATE in a transaction (MySQL doesn't support UPDATE...RETURNING)
• JSON type instead of JSONB
• Explicit VARCHAR lengths for indexed string columns
• FK handling adapted for MySQL schema patterns

Test plan

• Verify scheduler CRUD operations work with MySQL 8.0+
• Verify claim_due_schedule concurrent safety with SKIP LOCKED
• Verify delete_schedule cascades to schedule_runs
• Verify async variants match sync behavior

🤖 Generated with Claude Code

[github-actions]

PR Triage

Missing tests: This PR modifies source code but does not include any test changes. Please add or update tests to cover your changes.

[kaiisfree]

Tests were added in the second commit (test: add unit tests for MySQL scheduler methods). 43 unit tests covering all implemented scheduler methods — this comment was posted before the test commit was pushed.