Query tracking

[MitchellShiell]

Goal

Add logging instrumentation to Arranger to capture search query volume
and tabular data downloads, then build a reporting script to aggregate
these for active researcher and platform usage metrics.

Projects Implicated

• iMicroSeq
• HCMI
• OHCRN
• ARGO
• DDP

Instrumentation

Add structured log events for the following interactions:

• Query execution log each time a search query is submitted via the
  Arranger GraphQL API
• Tabular download log each time a user exports results as TSV/CSV

Each log event should capture:

• Timestamp
• Event type (query | download)
• Platform / deployment identifier

Reporting

Build a script or query that aggregates log events to produce:

• Count of distinct active users (30-day rolling window)
• Count of query executions per period
• Count of tabular downloads per period
  • Total downloaded records

Notes

• Log output should be structured (JSON preferred) for easy parsing
• Reporting script should be portable across deployments
• Consider whether this belongs in Arranger core

Acceptance criteria

• Structured log events emitted for query executions and downloads
• Reporting script produces aggregate counts