db-src-util

The groupant beside tools/db/src/util.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

Facts

Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.

Components

component	label	where
approximant	partial	approximant
ast	partial	`syntax.json`
composition	partial	composition
cost	partial	invariant-and-cost
descriptant	present	descriptant
invariant	partial	invariant-and-cost
tests	bounded checks partial scope	tests

Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

id	type	label	where
`behavior_complement`	behavior_complement	partial source derived model	behavior_complement
`reverse_reconstruction`	reverse_reconstruction	partial source derived model	reverse_reconstruction
`epoch_euclidean_coordinates`	epoch_euclidean_coordinates	partial source derived model	epoch_euclidean_coordinates
`wildcard_order`	wildcard_order	partial source derived model	wildcard_order
`card_label_alias`	card_label_alias	partial source derived model	card_label_alias
`path_information_loss`	path_information_loss	partial source derived model	path_information_loss

Parts

db-src-util-wild

Model text

descriptant

Time, card labels and simple filesystem glob

sha1_hex returns lowercase digest; ts decomposes seconds using Euclidean day/rem and Gregorian civil conversion. date_suffix takes final ten bytes and tests digit/dash shape. expand handles only ~ and ~/; glob walks components, star-matches directory names, suppresses unreadable directories, retains files and sorts. wild matches prefix, sequential interior fragments and suffix.

Prospective epoch — 2026-10-31

Full source was reviewed before edits; external prospective.md records API states, failure order and predicted checks. Production prefix remains byte-identical; test additions are isolated cfg(test)/test items.

Observed epoch — 2026-10-31

2026-10-31 wave31: 16 selected target/name cases passed twice debug and twice release with identical sorted outcomes; six compiled source-behavior mutants failed assertions, exact bytes restored and positive checks passed. Evidence scope is only the named helpers/fixtures. External receipt directory: $MOVA_DATA/runs/octopus-wave31-store-2026-10-31. No DuckDB integration, production loader/corpus, training or GPU run.

Retained limitations

No SQL evaluation was substituted with a mock process. Missing DuckDB is a dependency gap, not passing database evidence. Partial syntax has no macro expansion/name resolution/types; Rust helpers and fixtures do not prove all models.

approximant

Time, card labels and simple filesystem glob forward relation

Domain

Finite valid-UTF8 inputs, representable counters/IDs, available memory; filesystem fixtures confined to owned temporary root. SQL semantics are conditional and unexecuted. Subject is the source and SHA256 bound in manifest; fragment applies only to declared byte range.

Approximation limits

Categorical parsing, exact identity, transactional effects and resource errors have no useful percentage approximation metric here. No executable surrogate is claimed. Future profiles, if justified, may use only 1%, 2%, 5%, 10% with a defined metric/reference/domain.

composition

Local scope composition

Parent relation: sha1_hex returns lowercase digest; ts decomposes seconds using Euclidean day/rem and Gregorian civil conversion. date_suffix takes final ten bytes and tests digit/dash shape. expand handles only ~ and ~/; glob walks components, star-matches directory names, suppresses unreadable directories, retains files and sorts. wild matches prefix, sequential interior fragments and suffix.

Child fragments isolate selected mechanisms and do not cover the entire file. Invocation order and shared state remain the parent's relation. Costs of a child are included in parent cost, not added a second time; independent branch scopes are tagged. A child reverse relation must preserve intermediate state compatibility, not imply unique whole-file reconstruction.

Children: [{"id":"db-src-util-wild","path":"wild.groupant"}]

models

Time, card labels and simple filesystem glob typed model catalog

Observation is one call/trace in the declared scope. Operators below are partial source-derived relations; complement is a proposed inner exclusion relation, reverse an outer compatible-antecedent relation retaining ambiguity. No universal proof follows from finite checks. Each oracle is the relevant named helper check below when it reaches the behavior; remaining SQL/effect cases are source review or proposed real-CLI checks.

behavior_complement

Nonmatching glob names cannot enter the next component frontier, and directories cannot remain final outputs. Invalid date shape yields None on safe slicing domain; impossible calendar dates are not excluded.

Domain/assumptions: Finite valid-UTF8 inputs, representable counters/IDs, available memory; filesystem fixtures confined to owned temporary root. SQL semantics are conditional and unexecuted. Subject is the source and SHA256 bound in manifest; fragment applies only to declared byte range.