The hierarchical blocking query recursively joins on dependencies with
a type filter. Without a composite index, SQLite must scan all
dependencies for a given depends_on_id and filter by type afterward.
With 10k+ issues and many dependencies per issue, this could cause
noticeable slowdowns in ready work calculations.
Changes:
- Added idx_dependencies_depends_on_type composite index to schema
- Added automatic migration for existing databases
- Index creation is silent and requires no user intervention
The recursive CTE now efficiently seeks (depends_on_id, type) pairs
directly instead of post-filtering.
Resolves: bd-59
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Co-Authored-By: Claude <noreply@anthropic.com>
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