domain-pricing-rules

Time-bounded, scoped price rules with overlap prevention and deterministic resolution

Tier	domain
Role	unclassified (baselined)
Path	`crates/domain/pricing-rules`
Edition	2021
Targets	domain_pricing_rules
Public items	38 across 0 modules
Tests	5

What it is for

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

A "price" is a rule row that applies to some subject (what you're pricing) under some scope (who/where/channel/etc), within a time window.

Key features:

JSONB scope for flexibility (party_id, channel, membership_tier, etc.)
PostgreSQL exclusion constraint prevents overlapping validity windows
Deterministic resolution: specificity > priority > valid_from > id

Capabilities

`NewPrice`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub struct NewPrice`

`Price`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub struct Price`
`Price :: fn builder(subject_type : impl Into <String>, subject_id : Uuid) -> PriceBuilder`
`Price :: fn to_money(& self) -> Money`
`Price :: fn is_valid_at(& self, at : DateTime <Utc>) -> bool`
`Price :: fn specificity(& self) -> usize`
`async fn resolve_catalog_item_price(pool : & PgPool, item_id : Uuid, context : & PricingContext,) -> Result <ResolvedPrice>`
`async fn resolve_catalog_item_prices(pool : & PgPool, item_ids : & Uuid, context : & PricingContext,) -> Result <Vec <(Uuid, Option <ResolvedPrice>)>>`

`PriceBuilder`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub struct PriceBuilder`
`PriceBuilder :: fn new(subject_type : impl Into <String>, subject_id : Uuid) -> Self`
`PriceBuilder :: fn scope(mut self, scope : JsonValue) -> Self`
`PriceBuilder :: fn amount_minor(mut self, amount : i64) -> Self`
`PriceBuilder :: fn money(mut self, money : & Money) -> Self`
`PriceBuilder :: fn currency(mut self, currency : impl Into <String>) -> Self`
`PriceBuilder :: fn valid_from(mut self, from : DateTime <Utc>) -> Self`
`PriceBuilder :: fn valid_to(mut self, to : DateTime <Utc>) -> Self`
`PriceBuilder :: fn priority(mut self, priority : i32) -> Self`
`PriceBuilder :: fn reason(mut self, reason : impl Into <String>) -> Self`
`PriceBuilder :: fn created_by(mut self, user_id : Uuid) -> Self`
`PriceBuilder :: fn build(self) -> Result <NewPrice>`

`PriceRepository`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub struct PriceRepository`
`PriceRepository :: async fn insert(pool : & PgPool, price : NewPrice) -> Result <Price>`
`PriceRepository :: async fn find_by_id(pool : & PgPool, id : Uuid) -> Result <Price>`
`PriceRepository :: async fn list_for_subject(pool : & PgPool, subject_type : & str, subject_id : Uuid,) -> Result <Vec <Price>>`
`PriceRepository :: async fn resolve(pool : & PgPool, subject_type : & str, subject_id : Uuid, context : & PricingContext, at : Option <DateTime <Utc>>,) -> Result <ResolvedPrice>`
`PriceRepository :: async fn delete(pool : & PgPool, id : Uuid) -> Result <()>`
`PriceRepository :: async fn deactivate(pool : & PgPool, id : Uuid) -> Result <Price>`
`PriceRepository :: async fn end_at(pool : & PgPool, id : Uuid, end_time : DateTime <Utc>) -> Result <Price>`

`PricingContext`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub struct PricingContext`
`PricingContext :: fn new() -> Self`
`PricingContext :: fn with(mut self, key : impl Into <String>, value : impl Into <JsonValue>) -> Self`
`PricingContext :: fn with_party(self, party_id : Uuid) -> Self`
`PricingContext :: fn with_channel(self, channel : impl Into <String>) -> Self`
`PricingContext :: fn to_json(& self) -> JsonValue`

`PricingRulesError`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub enum PricingRulesError`

`ResolvedPrice`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub struct ResolvedPrice`
`ResolvedPrice :: fn to_money(& self) -> Money`

`Result`

Pricing Rules: Time-bounded, scoped price rules with overlap prevention

Item
`pub type Result<T>: std::result::Result <T, PricingRulesError>`

How to use it

No examples/ target and no doctest in this crate's rustdoc. The tests listed under Verification are the closest executable usage.

Module structure

No public modules: the crate root is its whole surface.

Public surface

`crate root`

Item	What it is
`pub enum PricingRulesError`	—
`pub type Result<T>: std::result::Result <T, PricingRulesError>`	—
`pub struct Price`	A price rule that applies to a subject under a scope within a time window
`Price :: fn builder(subject_type : impl Into <String>, subject_id : Uuid) -> PriceBuilder`	Create a new price builder
`Price :: fn to_money(& self) -> Money`	Convert amount to Money type
`Price :: fn is_valid_at(& self, at : DateTime <Utc>) -> bool`	Check if this price is currently valid
`Price :: fn specificity(& self) -> usize`	Get the specificity (number of scope keys)
`pub struct PriceBuilder`	Builder for creating new prices
`PriceBuilder :: fn new(subject_type : impl Into <String>, subject_id : Uuid) -> Self`	—
`PriceBuilder :: fn scope(mut self, scope : JsonValue) -> Self`	Set the scope (who/where/channel this price applies to)
`PriceBuilder :: fn amount_minor(mut self, amount : i64) -> Self`	Set the price amount in minor units (cents)
`PriceBuilder :: fn money(mut self, money : & Money) -> Self`	Set the price from a Money value
`PriceBuilder :: fn currency(mut self, currency : impl Into <String>) -> Self`	Set the currency
`PriceBuilder :: fn valid_from(mut self, from : DateTime <Utc>) -> Self`	Set when this price becomes valid
`PriceBuilder :: fn valid_to(mut self, to : DateTime <Utc>) -> Self`	Set when this price expires (exclusive)
`PriceBuilder :: fn priority(mut self, priority : i32) -> Self`	Set the priority for tie-breaking (higher wins)
`PriceBuilder :: fn reason(mut self, reason : impl Into <String>) -> Self`	Set the reason for this price (audit trail)
`PriceBuilder :: fn created_by(mut self, user_id : Uuid) -> Self`	Set who created this price
`PriceBuilder :: fn build(self) -> Result <NewPrice>`	Validate and build the price (does not persist)
`pub struct NewPrice`	A new price ready to be inserted
`pub struct PricingContext`	Context for price resolution - contains all attributes that might affect pricing The context is matched against price scopes using containment: `context @> scope` - the context must contain all keys in the price's scope
`PricingContext :: fn new() -> Self`	—
`PricingContext :: fn with(mut self, key : impl Into <String>, value : impl Into <JsonValue>) -> Self`	Add an attribute to the context
`PricingContext :: fn with_party(self, party_id : Uuid) -> Self`	Add a `party_id` to the context
`PricingContext :: fn with_channel(self, channel : impl Into <String>) -> Self`	Add a channel to the context
`PricingContext :: fn to_json(& self) -> JsonValue`	Convert to JSON value for database query
`pub struct ResolvedPrice`	The result of price resolution - the best matching price for a subject
`ResolvedPrice :: fn to_money(& self) -> Money`	Convert to Money type
`pub struct PriceRepository`	Repository for price operations
`PriceRepository :: async fn insert(pool : & PgPool, price : NewPrice) -> Result <Price>`	Insert a new price
`PriceRepository :: async fn find_by_id(pool : & PgPool, id : Uuid) -> Result <Price>`	Find a price by ID
`PriceRepository :: async fn list_for_subject(pool : & PgPool, subject_type : & str, subject_id : Uuid,) -> Result <Vec <Price>>`	List all prices for a subject
`PriceRepository :: async fn resolve(pool : & PgPool, subject_type : & str, subject_id : Uuid, context : & PricingContext, at : Option <DateTime <Utc>>,) -> Result <ResolvedPrice>`	Resolve the best matching price for a subject at a given time with context Resolution order (first criterion that differs wins): 1
`PriceRepository :: async fn delete(pool : & PgPool, id : Uuid) -> Result <()>`	Soft delete a price
`PriceRepository :: async fn deactivate(pool : & PgPool, id : Uuid) -> Result <Price>`	Deactivate a price (keeps it for history but excludes from resolution)
`PriceRepository :: async fn end_at(pool : & PgPool, id : Uuid, end_time : DateTime <Utc>) -> Result <Price>`	End a price at a specific time (sets `valid_to`)
`async fn resolve_catalog_item_price(pool : & PgPool, item_id : Uuid, context : & PricingContext,) -> Result <ResolvedPrice>`	Resolve the price for a catalog item
`async fn resolve_catalog_item_prices(pool : & PgPool, item_ids : & Uuid, context : & PricingContext,) -> Result <Vec <(Uuid, Option <ResolvedPrice>)>>`	Resolve prices for multiple catalog items

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

Boundary

Reaches into foundation.

Shares tier domain with 41 other crates: domain-agreements, domain-ai-report, domain-billing, domain-catalog, domain-classify, domain-comments, domain-competitive-intel, domain-contact, … (41 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)	`domain`
Architectural role (taxonomy)	`unclassified (baselined)`
Location	`crates/domain/pricing-rules`
Vocabulary in force (lexicon)	`current`

Tier flow. Which tiers this crate's own edges cross.

flowchart LR
  n_domain["domain"] --> n_foundation["foundation"]

Dependencies

Runtime, in this workspace.

Crate	Tier	Optional	Only on
`foundation-money`	foundation	no	always

Runtime, from outside the workspace.

Crate	Requirement	Features	Optional	Only on
`async-trait`	`^0.1`	—	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
`uuid`	`^1`	`v4`, `v7`, `serde`, `js`	no	always

Development, from outside the workspace.

Crate	Requirement	Features	Optional	Only on
`rust_decimal_macros`	`^1`	—	no	always
`tokio`	`^1`	`full`	no	always
`tokio-test`	`^0.4`	—	no	always

Build. None.

Depended on by. 2 workspace crates.

Signal flow — what reaches this crate, and what it reaches.

flowchart LR
  n_application_pricing_rules["application-pricing-rules"] -->|uses| SELF
  n_platform_privacy_scan_api["platform-privacy-scan-api"] -->|uses| SELF
  SELF["domain-pricing-rules"]
  SELF -->|runtime| n_foundation_money["foundation-money"]
  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	`domain_pricing_rules`	`src/lib.rs`

Error model

Error type	Named by
`PricingRulesError`	`Result`

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	none detected

No unsafe block, unsafe fn, unsafe impl or unsafe trait was found by the parser anywhere in this crate's source.

Configuration

No environment variable is read with a literal name anywhere in this crate. A variable whose key is computed at run time cannot be listed here, and is not claimed to be absent.

2 workspace crates depend on this one: application-pricing-rules, platform-privacy-scan-api.

Verification

Kind	Count
Unit tests	5
Integration tests	0
Examples	0
Doctests	0

Evidence by module. How often each public module is named by something executable.

Module	Tests	Examples	Consumers
`crate root`	10	0	3

What the tests establish, by name:

test_price_builder_validation — src/lib.rs
test_price_specificity — src/lib.rs
test_price_validity — src/lib.rs
test_pricing_context_building — src/lib.rs
test_resolved_price_to_money — src/lib.rs

Documentation coverage

Measure	Documented	Total
Public items with rustdoc	34	38
Public modules with a `//!` block	0	0

pie showData
    title Public items with rustdoc
    "Documented" : 34
    "No rustdoc detected" : 4

Metrics

Metric	Value
Rust source files	1
Source lines	721
Code lines	502
Public API items	38
Public modules	0
Tests	5
Examples	0
Cargo features	0
Direct runtime dependencies	9
Workspace reverse dependencies	2

pie showData
    title Public API by kind
    "enum" : 1
    "function" : 2
    "method" : 28
    "struct" : 6
    "type alias" : 1

pie showData
    title Rust source composition
    "Code" : 502
    "Blank or comment" : 219

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

NewPrice

Price

PriceBuilder

PriceRepository

PricingContext

PricingRulesError

ResolvedPrice

Result

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

`NewPrice`

`Price`

`PriceBuilder`

`PriceRepository`

`PricingContext`

`PricingRulesError`

`ResolvedPrice`

`Result`