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Coverage Map

The Coverage Map at /data-quality/coverage shows which tables and columns have DQ rules and which don't. It's the gap analysis: "of the 1,200 tables in prod, how many have at least one rule? Which critical tables are uncovered?".

Heatmap view​

The default view is a heatmap with:

  • Rows — schemas (or tables, depending on zoom)
  • Columns — DQ dimensions (Completeness, Accuracy, Timeliness, Consistency)
  • Cell colour — coverage % (red = 0%, green = 100%)

Click any cell to drill into the gap (which tables are missing rules for that dimension).

Counts​

Top of the page shows:

  • Total tables in scope — derived from filters
  • With ≥ 1 rule — count + %
  • Critical tables uncovered — tables marked critical with no rules
  • Total rules — across all engines

Filters​

  • Catalog / schema scope
  • Domain (from Business Glossary)
  • Certification status — filter to certified-only for governance audit
  • Owner team

Recommendations​

For uncovered tables, the page suggests rule templates based on column profiles (Column Profiling — null-rate thresholds, range checks, regex patterns):

  • Suggested DQX rules — auto-generatable from existing profile
  • Suggested suite — Great Expectations suite scaffolds
  • Reconciliation candidate — if the table is a clone target

Click Generate to scaffold; rules land in the Rules Engine for review before activation.

Targets​

Set coverage targets per domain or team. Below-target groups appear in the Gaps strip at the top with a click-through to the uncovered tables.

API​

GET /data-quality/coverage?scope=catalog&catalog=prod_warehouse
GET /data-quality/coverage/gaps?domain=sales
POST /data-quality/coverage/generate-rules