Introduces galaxy.tool_source_store: a queryable store of parsed,
macro-expanded tool sources plus a pre-computed ToolIndex of the metadata
batch consumers need (panel section, labels, EDAM, requirements, test
counts, shed provenance).
- Backends: database (store-owned tool_source_record + tool_index tables,
migration f5a73c8b9d12), sqlalchemy (read-only SQLite bundles, e.g.
CVMFS-shipped), and a composite that layers named stores over the
default with read fall-through.
- scripts/tool_source/populate_store.py walks tool_conf files and writes
sources + index + whoosh search index; --watch updates the store on
file changes and broadcasts reload_tool_source_cache. The populator is
the single writer; consumers are read-only.
- Per-conf opt-in via store="name" on a toolbox conf root, resolved
against the tool_source_stores catalog in galaxy.yml.
- The tool_source_record table is deliberately separate from tool_source,
whose rows belong to the job-request path and carry a raw-string
payload contract.
Nothing reads from the store yet — an on-demand-loading toolbox consuming
it is follow-up work (#22633). Extracted from that PR.