Forge singleton module — single-row configuration tables pattern.
| Tier | application |
| Role | unclassified (baselined) |
| Path | crates/application/singleton |
| Edition | 2024 |
| Targets | application_singleton |
| Public items | 6 across 0 modules |
| Tests | 0 |
What it is for
application-singleton — single-row config table pattern.
B-009 Gate-0.5 finding: foundation-singleton (crates/foundation/singleton) does have a migrations/ directory (001_singleton_pattern.sql), but every line in that file is a -- comment — it is a documentation/template migration showing consumers HOW to build their own singleton table (fixed id = 1 PK + a UNIQUE INDEX ON (TRUE)), not schema this library crate owns itself. There is no CREATE TABLE (or any other executable statement) to vendor — this crate declares no domain rows, so migrations() staying empty is correct, not an oversight. permission_codes() stays empty too: the library crate defines no permission/capability constants of its own — the pattern is generic and gets its permission vocabulary from whichever table a consumer builds with it.
Capabilities
SingletonModule
application-singleton — single-row config table pattern.
| Item |
|---|
pub struct SingletonModule |
SingletonModule :: fn new() -> Self |
SingletonModule :: fn name(& self) -> & 'static str |
SingletonModule :: fn version(& self) -> & 'static str |
SingletonModule :: fn migrations(& self) -> Vec <MigrationSet> |
SingletonModule :: async fn migrate_pending(& self, _pool : & PgPool) -> std::result::Result <u32, MigrationError> |
How to use it
No examples/ target, no doctest, and no test. No executable usage of this crate exists in the repository to project.
Module structure
No public modules: the crate root is its whole surface.
Public surface
`crate root`
| Item | What it is |
|---|---|
pub struct SingletonModule | — |
SingletonModule :: fn new() -> Self | — |
SingletonModule :: fn name(& self) -> & 'static str | — |
SingletonModule :: fn version(& self) -> & 'static str | — |
SingletonModule :: fn migrations(& self) -> Vec <MigrationSet> | — |
SingletonModule :: async fn migrate_pending(& self, _pool : & PgPool) -> std::result::Result <u32, MigrationError> | — |
No pub use re-exports: every item above is declared in this crate.
Boundary
Reaches into foundation.
Shares tier application with 120 other crates: application-agreements, application-ai, application-analytics, application-approvals, application-assessments, application-audit-log, application-auth, application-billing, … (120 total).
_What this crate deliberately does NOT own is a judgment. No committed registry records one for it, so none is stated here._
Where it sits
| Tier (ontology) | application |
| Architectural role (taxonomy) | unclassified (baselined) |
| Location | crates/application/singleton |
| Vocabulary in force (lexicon) | current |
Tier flow. Which tiers this crate's own edges cross.
flowchart LR n_application["application"] --> n_foundation["foundation"]
Dependencies
Runtime, in this workspace.
| Crate | Tier | Optional | Only on |
|---|---|---|---|
| `application-core` | application | no | always |
| `foundation-singleton` | foundation | no | always |
Runtime, from outside the workspace.
| Crate | Requirement | Features | Optional | Only on |
|---|---|---|---|---|
async-trait | ^0.1 | — | no | always |
sqlx | ^0.8 | runtime-tokio, postgres, chrono, uuid, json | no | always |
Development. None.
Build. None.
Depended on by. Nothing in this workspace.
Signal flow — what reaches this crate, and what it reaches.
flowchart LR SELF["application-singleton"] SELF -->|runtime| n_application_core["application-core"] SELF -->|runtime| n_foundation_singleton["foundation-singleton"] classDef self fill:#1f883d,stroke:#1f883d,color:#fff; class SELF self;
Feature flags
No Cargo features are defined: every capability is unconditional, so no consumer can receive a half-wired crate.
Targets
| Kind | Name | Source |
|---|---|---|
| lib | application_singleton | `src/lib.rs` |
Error model
No public error type was detected: no public item declares a type named *Error, and no public signature returns one.
Operational characteristics
| Property | Evidence |
|---|---|
| async public surface | yes |
| async runtime | none detected |
| database access | yes |
| network I/O | none detected |
| unsafe code | none detected |
| environment variables | yes |
No unsafe block, unsafe fn, unsafe impl or unsafe trait was found by the parser anywhere in this crate's source.
Configuration
| Variable | Read in |
|---|---|
CARGO_PKG_VERSION | src/lib.rs |
Related capabilities
No workspace crate depends on this one.
Verification
No test, example or doctest was found in this crate. Nothing here is proven by the crate itself.
Documentation coverage
| Measure | Documented | Total |
|---|---|---|
| Public items with rustdoc | 0 | 6 |
Public modules with a //! block | 0 | 0 |
pie showData
title Public items with rustdoc
"Documented" : 0
"No rustdoc detected" : 6
Metrics
| Metric | Value |
|---|---|
| Rust source files | 1 |
| Source lines | 45 |
| Code lines | 28 |
| Public API items | 6 |
| Public modules | 0 |
| Tests | 0 |
| Examples | 0 |
| Cargo features | 0 |
| Direct runtime dependencies | 4 |
| Workspace reverse dependencies | 0 |
pie showData
title Public API by kind
"method" : 5
"struct" : 1
pie showData
title Rust source composition
"Code" : 28
"Blank or comment" : 17
Generation
Rendered by tools-corpus corpus readme from repository evidence alone, renderer schema 2, lexicon current. No model, network service or database was consulted. Regenerate with tools-corpus corpus readme --write; verify with --check.