application-pricing

Forge pricing module — depends on application-catalog for basket/order types. Sprint 60.

Tier	application
Role	unclassified (baselined)
Path	`crates/application/pricing`
Edition	2024
Targets	application_pricing
Public items	15 across 2 modules
Tests	0

What it is for

application-pricing — Layer 3 module. Sprint 60. Depends on application-catalog.

B-009 Gate-0.5 investigation: this crate wraps no schema-owning library crate. Its Cargo.toml depends only on application-catalog (already wired for B-009, see application-catalog's own migrations()); there is no domain-pricing dependency at all. crates/domain/pricing (the crate literally named domain-pricing) ships no migrations/ directory — it is pure-compute Tier/TieredPrice/PriceBreak/ Discount/PricingCalculator logic with no sqlx/PgPool usage anywhere in its source, unrelated to this module's one DB table.

The one table services::pricing actually reads/writes (customer_role_tier_discounts, per that module's own doc comment) was authored directly in application-engine's central platform set (crates/application/engine/migrations/059_tier_discounts.sql) for Sprint 25.tier — it was never extracted into a standalone library crate crate with its own migrations/ directory, so there is nothing this module can vendor via include_str!. migrations() staying empty is correct, not an oversight; a host mounting application-pricing standalone (outside application-engine) must supply customer_role_tier_discounts itself.

Capabilities

`PricingModule`

application-pricing — Layer 3 module. Sprint 60. Depends on application-catalog.

Item
`pub struct PricingModule`
`PricingModule :: fn new() -> Self`
`PricingModule :: fn name(& self) -> & 'static str`
`PricingModule :: fn version(& self) -> & 'static str`
`PricingModule :: fn migrations(& self) -> Vec <MigrationSet>`
`PricingModule :: async fn migrate_pending(& self, _pool : & PgPool) -> Result <u32, MigrationError>`

`services::pricing (other)`

Pricing service.

Item
`async fn set_role_discount(pool : & PgPool, role_slug : & str, discount_rate : Decimal,) -> Result <(), CatalogError>`
`async fn get_role_discount(pool : & PgPool, role_slug : & str,) -> Result <Option <Decimal>, CatalogError>`
`async fn list_role_discounts(pool : & PgPool) -> Result <Vec <(String, Decimal)>, CatalogError>`
`async fn best_discount_for_party(pool : & PgPool, party_id : Uuid,) -> Result <Decimal, CatalogError>`
`async fn checkout_for_party(pool : & PgPool, basket_id : Uuid, party_id : Uuid, quoted_total : Decimal,) -> Result <Order, CatalogError>`

`PriceQuote`

Pricing service.

Item
`pub struct PriceQuote`
`fn quote_basket(items : & BasketItem, currency : & str) -> Result <PriceQuote, CatalogError>`
`async fn quote_for_party(pool : & PgPool, basket_id : Uuid, party_id : Uuid,) -> Result <PriceQuote, CatalogError>`

`QuoteLine`

Pricing service.

Item
`pub struct QuoteLine`

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

application_pricing

services
services::pricing

flowchart TD
  n_application_pricing["application_pricing"]
  n_application_pricing --> n_services["services"]
  n_services --> n_services__pricing["pricing"]

Public surface

`crate root`

Item	What it is
`pub struct PricingModule`	—
`PricingModule :: fn new() -> Self`	—
`PricingModule :: fn name(& self) -> & 'static str`	—
`PricingModule :: fn version(& self) -> & 'static str`	—
`PricingModule :: fn migrations(& self) -> Vec <MigrationSet>`	—
`PricingModule :: async fn migrate_pending(& self, _pool : & PgPool) -> Result <u32, MigrationError>`	—

`services::pricing`

Item	What it is
`pub struct PriceQuote`	Quote returned to the customer at /quote time
`pub struct QuoteLine`	—
`fn quote_basket(items : & BasketItem, currency : & str) -> Result <PriceQuote, CatalogError>`	Pure compute
`async fn set_role_discount(pool : & PgPool, role_slug : & str, discount_rate : Decimal,) -> Result <(), CatalogError>`	Set (or replace) the discount rate for a customer-role slug
`async fn get_role_discount(pool : & PgPool, role_slug : & str,) -> Result <Option <Decimal>, CatalogError>`	—
`async fn list_role_discounts(pool : & PgPool) -> Result <Vec <(String, Decimal)>, CatalogError>`	—
`async fn best_discount_for_party(pool : & PgPool, party_id : Uuid,) -> Result <Decimal, CatalogError>`	Resolve the best discount rate for the party
`async fn quote_for_party(pool : & PgPool, basket_id : Uuid, party_id : Uuid,) -> Result <PriceQuote, CatalogError>`	Quote a basket for a specific party — DB-touching orchestrator that resolves the customer's best applicable discount, then applies it on top of the pure `quote_basket` subtotal
`async fn checkout_for_party(pool : & PgPool, basket_id : Uuid, party_id : Uuid, quoted_total : Decimal,) -> Result <Order, CatalogError>`	Checkout a basket for a party, freezing the discount onto the order at placement time (D-US-25.tier.3)

No pub use re-exports: every item above is declared in this crate.

Boundary

Depends on no other workspace tier.

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/pricing`
Vocabulary in force (lexicon)	`current`

Dependencies

Runtime, in this workspace.

Crate	Tier	Optional	Only on
`application-catalog`	application	no	always
`application-core`	application	no	always

Runtime, from outside the workspace.

Crate	Requirement	Features	Optional	Only on
`async-trait`	`^0.1`	—	no	always
`axum`	`^0.7`	`multipart`	no	always
`chrono`	`^0.4`	`serde`	no	always
`rust_decimal`	`^1`	`serde`	no	always
`serde`	`^1`	`derive`	no	always
`serde_json`	`^1`	—	no	always
`sqlx`	`^0.8`	`runtime-tokio`, `postgres`, `chrono`, `uuid`, `json`	no	always
`thiserror`	`^2`	—	no	always
`tracing`	`^0.1`	—	no	always
`uuid`	`^1`	`v4`, `v7`, `serde`, `js`	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-pricing"]
  SELF -->|runtime| n_application_catalog["application-catalog"]
  SELF -->|runtime| n_application_core["application-core"]
  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_pricing`	`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	yes
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`

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	6	15
Public modules with a `//!` block	1	2

pie showData
    title Public items with rustdoc
    "Documented" : 6
    "No rustdoc detected" : 9

Metrics

Metric	Value
Rust source files	3
Source lines	243
Code lines	162
Public API items	15
Public modules	2
Tests	0
Examples	0
Cargo features	0
Direct runtime dependencies	12
Workspace reverse dependencies	0

pie showData
    title Public API by kind
    "function" : 7
    "method" : 5
    "struct" : 3

pie showData
    title Rust source composition
    "Code" : 162
    "Blank or comment" : 81

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.

What it is for

Capabilities

PricingModule

services::pricing (other)

PriceQuote

QuoteLine

How to use it

Module structure

Public surface

Boundary

Where it sits

Dependencies

Feature flags

Targets

Error model

Operational characteristics

Configuration

Related capabilities

Verification

Documentation coverage

Metrics

Generation

`PricingModule`

`services::pricing (other)`

`PriceQuote`

`QuoteLine`