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fix: align SQL scanners and remove obsolete implementations #992

Job	Run time
Classify verification scope	7s
Lockfile consistency	10s
Formatter performance guards	5m 38s
Fresh-process compile (3000 models)	6m 27s
Dense all-rules compile (3000 models)	6m 41s
Fresh-process compile cache (10000 models)	9m 33s
PostgreSQL integration and E2E tests	7m 7s
Static checks and unit + integration tests	13m 33s
Dense all-rules compile (10000 models)	6m 53s
Dense all-rules compile (1000 models)	6m 24s
Fresh-process compile (10000 models)	6m 57s
Fresh-process compile cache (5000 models)	8m 13s
DuckDB E2E (build virtual)	9m 54s
Fresh-process compile cache (3000 models)	7m 34s
DuckDB E2E (build incremental)	9m 16s
Fresh-process compile (5000 models)	4m 58s
Dense all-rules compile (5000 models)	7m 4s
DuckDB E2E (virtual environments)	12m 10s
DuckDB E2E (CLI data)	6m 37s
DuckDB E2E (integrations)	6m 53s
DuckDB E2E (build core)	8m 49s
DuckDB E2E (CLI commands)	8m 51s
Rules performance guards	0s
Performance guards	0s
Verify	3s
	2h 39m 52s