v0.4.0

ON CONFLICT target API (0.4.0)

New features

• ON CONFLICT target columns: .onConflict("id").doNothing() and .onConflict("unique_id").doUpdateSet(...)
• ON CONFLICT ON CONSTRAINT: .onConflictOnConstraint("pk_users").doNothing()
• Static helpers: InsertQuery.excluded("col") → "col = EXCLUDED.col" and InsertQuery.setClause("col", "expr") → "col = expr"
• Unified batch columns: batch rows with different column sets now produce correct SQL with NULL padding

Deprecated (still work)

• .onConflictDoNothing() → use .onConflict().doNothing()
• .onConflictDoUpdate() → use .onConflict().doUpdateSet()