Module conversion 

Lossless value conversion for guarded logical field migrations. Adapters use the same preflight before changing any physical representation.

Functions

apply_declaration

Replays a declaration transition without changing earlier migration identities.

convert_value

Converts one admitted stored value, rejecting truncation, rounding and invented defaults.

normalize_field_change

Reuses lossless conversion while separating an explicitly retired physical check from the logical values admitted before and after the migration.

previous_schema

Validates a field transition and reconstructs the schema used to read historical values.

query

Reads bounded conversion pages in stable identity order without exporting an app.

schema_after_step

Reconstructs the declared schema after one step, excluding later schema changes. Conversion must not inspect fields or tables that the same migration has not created yet.

staging_name

Names an internal staging entity deterministically so interrupted migration can resume.

staging_schema

Builds a complete target-row staging entity to validate fields and cross-field indexes.

statements

Stages typed values through ordinary safe parameter binding without mutating source records.