v2.0.0

v2.0.0

Breaking change: raw migration variable expansion

Migration placeholders matching ${MIGRATION_[A-Z0-9_]+} are now replaced
byte-for-byte with their environment values in one regex pass. Replacement is
allowed in every SQL lexical context, including quoted strings, identifiers,
comments, dollar-quoted bodies, adjacent text, and raw SQL fragments.

The runner no longer automatically quotes, escapes, casts, or validates a
replacement as SQL. Migration authors must provide any required SQL syntax,
including string quotes, casts, and dollar-quote delimiters. Migrations that
relied on the previous PostgreSQL-literal rendering or standalone-placeholder
validation must be updated before using v2.0.0.

Preserved contracts

• Repeated placeholders use the first lookup result, in first-occurrence order.
• Unset variables fail before SQL execution; explicitly empty values are valid.
• NUL-containing values are rejected.
• Replacement markers are not recursively expanded.
• {{ ENV_NAME }} is rendered before migration variables; marker text
  introduced by a migration variable remains unchanged.
• Source SQL, hashes, migration logs, and --final-sql remain canonical and do
  not contain resolved environment values.
• Database execution errors remain redacted while preserving Go unwrapping.