Database
Index Selectivity Estimator
Total rows and distinct values in a column, turned into a selectivity score - and whether an index there will actually help or get ignored.
0.0004% selectivity - Poor
Low selectivity - the query planner may skip this index entirely and prefer a full table scan, since reading the index plus the table can cost more than just scanning.
This is one question. ArchSetu answers it for a whole repository.
Call graph, dead code, blast radius and a health score, in about a minute.
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