relspecgo/tests/_plans/diff-merge.md

Plan: pkg/diff (65.5%) and pkg/merge (75.1%)

Existing

• diff: diff_test.go, formatters_test.go
• merge: merge_test.go

pkg/diff

Func	Now	Cases
compareSchemaDetails	0%	Description/owner/options changed
compareConstraintDetails, normalizeConstraintAction	0%	Columns, referenced table, on-update/on-delete variants and case/default normalisation
compareRelationshipDetails	0%	Changed endpoints/type
compareViews, compareViewDetails	0%	Added/removed/changed definition
compareSequences, compareSequenceDetails	0%	Added/removed/changed increment/min/max/start

Data: pair examples/test_schema.dbml and test_schema_modified.dbml; add view/sequence changes in code-built fixtures.

pkg/merge

Func	Now	Cases
mergeSequences, cloneSequence	33% / 0%	New, existing, conflicting; clone is deep
cloneSchema	48%	Views, sequences, scripts, indexes cloned independently
extractTypeParts	48%	Precision/scale, arrays, schema-qualified, no modifiers
GetColumnTypeConflictSummary, min	0%	Limit truncation, zero conflicts

Live DB cases (dbtest)

• pgsql live diff/merge against a real DB: dbtest.sh test postgres; reuse tests/postgres/init.sql as the live side and examples/test_schema*.dbml as the desired side.