Add a feature roadmap and implementation plan for a consensus-based algorithm for the condition code in the current conditions endpoint

README.md

@@ -26,14 +26,11 @@ database credentials through your normal secret-management process.
 - Hourly and narrative forecasts
 - Forecast discussions
 - Weather stories
-- Convective outlooks:
+- Convective outlooks
-  - `GET /outlooks/convective`
-  - `GET /outlooks/convective/active`
-  - `GET /outlooks/convective/location`
 
 Common query parameters include `format`, `units`, and route-specific options
 such as forecast `precision`, timezone `tz` / `TZ`, and outlook filters
-`day`, `outlookType`, and `containsLocation`.
+`day` and `outlookType`.
 
 See [`docs/api.md`](docs/api.md) for the HTTP contract.
 

docs/api.md

@@ -194,7 +194,8 @@ GET /conditions/current?format=json&precision=0
 GET /alerts/active
 ```
 
-Returns the latest stored alert run filtered to alerts active at request time.
+Returns the latest stored alert run filtered to alerts active at request time,
+omitting older alerts superseded by newer alert references in the same run.
 
 Query parameters: `format`, `units`.
 
@@ -212,14 +213,20 @@ Run `data` fields:
 | `alerts` | array | active alerts, possibly empty |
 
 Alerts are active when `messageType` is not `Cancel`, `effective` is absent or
-at or before request time, and `expires` is absent or after request time.
+at or before request time, and the alert end boundary is absent or after request
+time. The end boundary prefers `ends`; if `ends` is absent, `expires` is used as
+a fallback for older rows or providers that do not supply an alert-period end.
 `onset` is presented when available but is not used as the active boundary.
+After active-time filtering, alerts referenced by another alert in the same run
+are omitted as superseded. References from update and cancel messages are both
+honored, even when the referencing alert is not itself returned.
 
 Alert fields include `id`, `event`, `headline`, `severity`, `urgency`,
 `certainty`, `status`, `messageType`, `category`, `response`, `description`,
-`instruction`, `sent`, `effective`, `onset`, `expires`, `areaDescription`,
+`instruction`, `sent`, `effective`, `onset`, `ends`, `expires`,
-`senderName`, and `references`. Most alert fields are optional except `id` when
+`areaDescription`, `senderName`, and `references`. Most alert fields are
-an alert item is present.
+optional except `id` when an alert item is present. `ends` is the alert-period
+end; `expires` is provider expiration metadata.
 
 Reference fields are `id`, `identifier`, `sender`, and `sent`.
 
@@ -234,7 +241,6 @@ GET /alerts/active?format=text
 ```http
 GET /outlooks/convective
 GET /outlooks/convective/active
-GET /outlooks/convective/location
 ```
 
 Returns the latest SPC convective outlook run reconstructed from
@@ -246,9 +252,6 @@ Route behavior:
   outlook polygons unless user filters are supplied.
 - `/outlooks/convective/active` adds an active-time filter using the server's
   current UTC time. Outlooks are active when `validFrom <= now < validTo`.
-- `/outlooks/convective/location` adds the same active-time filter and
-  `containsLocation=true`. It remains as an active local-outlook compatibility
-  route under the v2 weatherfeeder contract.
 
 When no latest run exists, `data` is null. When a run exists but filters match
 no outlooks, `data` remains an object and `outlooks` and `discussions` are
@@ -262,14 +265,10 @@ Query parameters:
 | `format`, `units`, `tz` / `TZ` | all outlook routes | shared rules above |
 | `day` | all outlook routes | `1`, `2`, or `3` |
 | `outlookType` | all outlook routes | `categorical`, `tornado`, `hail`, or `wind` |
-| `containsLocation` | `/outlooks/convective`, `/outlooks/convective/active` | boolean |
 
 `outlookType` values are normalized case-insensitively. Weatherfeeder v2
-outlooks are already filtered for the configured location, so
+outlooks are already filtered for the configured location. `precision`,
-`containsLocation` is expected to be true for stored v2 outlooks.
+`containsLocation`, and unknown parameters are rejected.
-`containsLocation` is rejected on `/outlooks/convective/location` because that
-route always applies `containsLocation=true`. `precision` and unknown
-parameters are rejected.
 
 Run `data` fields:
 
@@ -314,7 +313,7 @@ Examples:
 
 ```http
 GET /outlooks/convective?day=1&outlookType=categorical
-GET /outlooks/convective/location?format=text&tz=CDT
+GET /outlooks/convective/active?format=text&tz=CDT
 ```
 
 Example JSON response:
@@ -367,53 +366,8 @@ Example JSON response:
 }
 ```
 
-Example location-filtered JSON response:
+Text format uses the shared convective outlook template for both outlook routes
-
+and renders a no-data message when `data` is null.
-```json
-{
-  "data": {
-    "locationId": "stl",
-    "asOf": "2026-06-11T18:00:00Z",
-    "outlooks": [
-      {
-        "id": "spc-day1-tor-2pct",
-        "provider": "spc",
-        "product": "convective",
-        "day": 1,
-        "outlookType": "tornado",
-        "label": "2%",
-        "validFrom": "2026-06-11T18:00:00Z",
-        "validTo": "2026-06-12T12:00:00Z",
-        "issuedAt": "2026-06-11T17:00:00Z",
-        "expiresAt": "2026-06-12T12:00:00Z",
-        "containsLocation": true,
-        "geometry": {
-          "type": "Polygon",
-          "coordinates": [
-            [
-              [-90.6, 38.4],
-              [-90.0, 38.4],
-              [-90.0, 38.8],
-              [-90.6, 38.4]
-            ]
-          ]
-        }
-      }
-    ],
-    "discussions": [
-      {
-        "day": 1,
-        "headline": "Tornado risk near the configured location",
-        "discussion": "SPC tornado outlook discussion text.",
-        "updatedAt": "2026-06-11T17:30:00Z"
-      }
-    ]
-  }
-}
-```
-
-Text format uses the shared convective outlook template for all three outlook
-routes and renders a no-data message when `data` is null.
 
 ### Forecasts
 

docs/integrations/weatherfeeder-postgres.md

@@ -105,8 +105,8 @@ and `event_emitted_at`.
 
 `alert_index`, `alert_id`, `event`, `headline`, `severity`, `urgency`,
 `certainty`, `status`, `message_type`, `category`, `response`, `description`,
-`instruction`, `sent`, `effective`, `onset`, `expires`, `area_description`,
+`instruction`, `sent`, `effective`, `onset`, `ends`, `expires`,
-`sender_name`, and `run_event_id`.
+`area_description`, `sender_name`, and `run_event_id`.
 
 ### `alert_references`
 

docs/internal/http-adapter.md

@@ -8,7 +8,7 @@ This document describes the internal HTTP adapter under
 
 The HTTP adapter turns feedapi route definitions into calls on the application
 service boundary. It owns route registration, query binding, request validation,
-forecast day-slice filtering, outlook active/location filter construction,
+forecast day-slice filtering, outlook active filter construction,
 alert active-time selection, response envelopes, and template names.
 
 ## Inputs and Outputs
@@ -36,7 +36,7 @@ The adapter may:
 - choose the presenter function for an endpoint;
 - filter forecast copies for `/today` and `/tomorrow`;
 - pass the current UTC instant to active-alert application filtering;
-- construct outlook active/location filters.
+- construct outlook active filters.
 
 The adapter must not:
 
@@ -99,10 +99,8 @@ common query values are lowercased and trimmed before binding where applicable.
 available only through binders used by forecast, discussion, weather story, and
 outlook routes.
 
-Outlook routes accept `day`, `outlookType`, and, except for
+Outlook routes accept `day` and `outlookType`. `containsLocation` is a response
-`/outlooks/convective/location`, `containsLocation`. The location route always
+field only and is rejected as a request parameter.
-adds `containsLocation=true` after binding and rejects an explicit
-`containsLocation` query value.
 
 ## Timezone Parsing
 
@@ -136,7 +134,12 @@ behavior deterministic.
 
 `/alerts/active` uses the shared `format` and `units` binder. The handler calls
 the application service with `alertNow().UTC()` so active alert filtering uses
-the request-time instant while remaining deterministic in endpoint tests.
+the request-time instant while remaining deterministic in endpoint tests. The
+application service prefers alert `ends` over `expires` when deciding whether an
+alert has ended. The application service also suppresses alerts referenced by
+another alert in the same latest run. This supersession rule uses alert
+references from update and cancel messages, even when the referencing message is
+not returned by `/alerts/active`.
 
 ## Outlook Filters
 
@@ -144,17 +147,13 @@ Outlook route filters are built at the HTTP boundary and passed to the
 application service:
 
 - `/outlooks/convective` uses only user-supplied filters;
-- `/outlooks/convective/active` adds `ActiveAt=outlookNow().UTC()`;
+- `/outlooks/convective/active` adds `ActiveAt=outlookNow().UTC()`.
-- `/outlooks/convective/location` adds the same active timestamp and
-  `ContainsLocation=true`.
 
-The package variable `outlookNow` exists so endpoint tests can make active and
+The package variable `outlookNow` exists so endpoint tests can make active
-location filtering deterministic.
+filtering deterministic.
 
 The application service returns filtered outlook copies and trims run-level
 discussions to days represented by retained outlooks.
-`/outlooks/convective/location` is retained for compatibility and active
-local-outlook behavior under the weatherfeeder outlook v2 contract.
 
 ## Failure Behavior
 

docs/internal/postgres-repository.md

@@ -79,8 +79,9 @@ successful responses with `data: null`.
 - `CurrentConditions`: aggregates recent rows from `observations` using the
   application-provided observation window.
 - `LatestAlertRun`: latest row from `alert_runs`, then child `alerts` and
-  `alert_references`. This is the latest stored alert snapshot; active-time
+  `alert_references`. This is the latest stored alert snapshot. The repository
-  filtering is performed by the application service.
+  maps both `ends` and `expires`; active-time filtering is performed by the
+  application service.
 - `LatestHourlyForecast`: latest `forecasts` row where `product = 'hourly'`,
   then child `forecast_periods`.
 - `LatestNarrativeForecast`: latest `forecasts` row where

docs/policy/architecture.md

@@ -100,7 +100,7 @@ Outputs are HTTP responses in JSON, XML, or text format. All public endpoint han
 
 `weatherapi` owns no durable weather state. Its runtime state is limited to process memory, loaded configuration, HTTP server state, template registry, renderer registry, and database connection pools. Durable weather data and schema creation are external concerns owned by `weatherfeeder` and Postgres.
 
-The API currently serves latest-resource views: latest observation, current conditions, latest hourly forecast, latest narrative forecast, latest forecast discussion, latest weather story run, latest individual weather story, and latest convective outlook run. Active alert, forecast `today` and `tomorrow`, and convective outlook active/location routes derive filtered copies from the latest stored run.
+The API currently serves latest-resource views: latest observation, current conditions, latest hourly forecast, latest narrative forecast, latest forecast discussion, latest weather story run, latest individual weather story, and latest convective outlook run. Active alert, forecast `today` and `tomorrow`, and convective outlook active routes derive filtered copies from the latest stored run.
 
 ## Configuration and CLI Boundaries
 

docs/roadmap/current.md

@@ -0,0 +1,56 @@
+# Current Conditions Condition-Code Selection
+
+## Summary
+
+Improve `/conditions/current` so numeric conditions continue to aggregate from recent observations, but `conditionCode` is selected by source-balanced WMO family consensus instead of numeric maximum. The goal is to prevent a single bad high WMO code, such as an erroneous thunderstorm code, from dominating current conditions while still returning a useful code when providers report semantically similar conditions.
+
+## Target Behavior
+
+Current conditions continue to use the application observation window, currently `app.ObservationWindowMinutesDefault`.
+
+Numeric and directional fields remain aggregate values over recent `observations` rows:
+
+- temperature, apparent temperature, dewpoint, relative humidity, and wind speed use averages;
+- wind direction uses circular averaging;
+- `isDay` comes from the latest row in the window.
+
+`conditionCode` uses source-balanced consensus:
+
+1. Select the latest observation per `event_source` within the current window.
+2. Each source contributes at most one WMO condition-code vote.
+3. Map each voted WMO code to a semantic family.
+4. Select the family with the highest source vote count.
+5. If the family vote is tied, return `model.WMOUnknown`.
+6. Within the winning family, select the most frequent exact WMO code.
+7. If exact-code vote is tied within the winning family, select the first code by family-specific representative ranking.
+8. If there are no recognized condition-code votes, return `model.WMOUnknown`.
+
+Family mapping and tie ranking:
+
+| Family | Codes / tie ranking |
+| --- | --- |
+| `clear_or_cloud` | `0`, `1`, `2`, `3` |
+| `fog` | `45`, `48` |
+| `drizzle` | `51`, `53`, `55`, `56`, `57` |
+| `rain` | `61`, `63`, `65`, `80`, `81`, `82`, `66`, `67` |
+| `snow` | `71`, `73`, `75`, `85`, `86`, `77` |
+| `thunderstorm` | `95`, `96`, `99` |
+
+Examples:
+
+| Source votes | Result |
+| --- | --- |
+| `0`, `1`, `2` | `0` |
+| `1`, `2`, `95` | `1` |
+| `0`, `95` | `model.WMOUnknown` |
+| `61`, `63`, `80` | `61` |
+| `61`, `95`, `0` | `model.WMOUnknown` |
+| only `95` | `95` |
+
+## Policy Decisions
+
+- No public response schema change is required.
+- No weatherfeeder change or database migration is required because `observations.event_source`, `condition_code`, `observed_at`, and `event_emitted_at` already exist.
+- Provider-specific blacklists, trust weights, and source priorities are intentionally out of scope for this change.
+- `WMOUnknown` is preferable to falsely choosing between tied precipitation, thunderstorm, and clear/cloud families.
+- Current conditions remain a latest-window read model, not a durable derived table.

docs/roadmap/implementation.md

@@ -1,247 +1,110 @@
-# Active Alert Filtering Cleanup
+# Implement Source-Balanced Current Conditions Condition Codes
-
-## Status
-
-Implementation, current-behavior documentation, and automated verification are
-complete.
-
-## Verification Record
-
-Completed on 2026-06-12:
-
-- `go test ./internal/app`
-- `go test ./internal/adapters/inbound/httpapi`
-- `go test ./internal/adapters/inbound/httpapi/presenter`
-- `go test ./...`
-
-Deployment smoke checks were not run from this workspace because the local
-repository state is not a deployed `weatherapi` instance.
 
 ## Summary
 
-Fix `/alerts/active` so it returns alerts that are active at request time, not merely every alert from the latest stored alert snapshot.
+Implement the target behavior in `docs/roadmap/current.md`: keep `/conditions/current` response shape unchanged, continue aggregating numeric observations over the current window, and replace SQL `MAX(condition_code)` with Go-based source-balanced WMO family consensus.
 
-The current implementation reads the latest `alert_runs` parent row, loads all child `alerts`, and presents the run unchanged. This can expose expired alerts when the latest persisted weatherfeeder snapshot is stale or when a snapshot contains alerts that later expire before the next successful ingestion cycle.
+This is a behavior change only. Do not add public fields, change query parameters, alter weatherfeeder tables, or add provider-specific blacklists.
 
-This cleanup preserves the existing route, response envelope, repository contract, and weatherfeeder table ownership. The change should be implemented as app-layer filtering over the latest stored snapshot, following the same architectural pattern already used by convective outlook active filtering.
+## Stage 1: Add Condition-Code Consensus Helpers
 
-## Current Behavior To Correct
+Add package-local helpers in `internal/adapters/outbound/postgres` for current-conditions condition-code selection.
 
-- `GET /alerts/active` calls `LatestAlertRun(ctx)`.
+Required data shape:
-- `LatestAlertRun(ctx)` returns the latest stored alert snapshot from Postgres.
-- All child alerts for that run are returned unchanged.
-- The endpoint does not compare `effective`, `onset`, `expires`, `status`, or `messageType` to the request time.
-- Expired alerts can therefore appear under an endpoint named `/alerts/active`.
 
-## Target Behavior
+- define a small candidate row/type containing `event_source` and `condition_code`;
+- the selector accepts latest-per-source candidates and returns `model.WMOCode`.
 
-- `GET /alerts/active` returns the latest stored alert run with `alerts` filtered to items active at request time.
+Required selector behavior:
-- Missing latest alert run still returns `{ "data": null }`.
-- A latest run with no currently active alerts returns a non-null run object with `alerts: []`.
-- The repository remains a latest-snapshot reader and does not own active-time policy.
-- The app service owns alert active filtering policy.
-- The HTTP adapter supplies the request-time instant using an injectable clock for tests.
-- Presentation remains responsible only for response shape, units no-op behavior, and rendering.
 
-## Active Alert Policy
+- use the family mapping and tie ranking from `docs/roadmap/current.md` exactly;
+- ignore unrecognized WMO codes for family voting;
+- return `model.WMOUnknown` when no recognized candidates exist;
+- count each source at most once;
+- return `model.WMOUnknown` on tied family votes;
+- inside the winning family, choose the most frequent exact code;
+- when exact codes tie inside the winning family, choose by family ranking.
 
-Use a single app-layer predicate for determining whether an alert is active at an instant `activeAt`.
+Add focused unit tests for the selector before wiring SQL changes.
 
-An alert is active when all of the following are true:
+## Stage 2: Split Current-Conditions Condition-Code Querying
 
-- `messageType` is not `Cancel`, case-insensitive after trimming.
+Update the Postgres current-conditions read path so condition-code selection is no longer computed with `MAX(condition_code)`.
-- `effective` is absent or `effective <= activeAt`.
-- `expires` is absent or `activeAt < expires`.
 
-Additional policy notes:
+Required SQL behavior:
 
-- Do not use `onset` as a required active boundary. `onset` can describe hazard onset and may be later than alert effective time; using it as a hard lower bound could hide valid watches, warnings, or advisories that are already in effect from an alerting perspective.
+- keep the existing aggregate query for sample count, numeric averages, circular wind direction, and latest `is_day`;
-- Do not filter by `status` in the first cleanup unless existing model/test data proves a specific non-active status must be excluded. NWS active feeds commonly use `Actual`; persisted historical snapshots may include other values, but time and cancellation policy are the high-confidence active criteria.
+- remove `MAX(condition_code)` from the aggregate query result;
-- Treat nil `expires` as active if the other criteria pass. This preserves data when an upstream alert omits an expiration, while still allowing future tightening if real data shows nil expiration should be suppressed.
+- add a separate query that returns one latest condition-code candidate per `event_source` inside the same observation window;
-- Preserve input alert order after filtering.
+- latest per source is ordered by `observed_at DESC, event_emitted_at DESC`;
-- Preserve run metadata such as `asOf`, location fields, latitude, and longitude even when all alerts are filtered out.
+- candidate columns should include `event_source` and `condition_code`; timestamp columns may remain SQL-only if used only for ordering.
 
-## Public API Impact
+Required repository flow:
 
-- Route remains `GET /alerts/active`.
+1. query aggregate current conditions;
-- Supported query parameters remain `format` and `units`.
+2. return `nil, nil` when the aggregate sample count maps to no data, preserving current behavior;
-- `precision`, `tz` / `TZ`, and unknown query parameters remain rejected unless a separate roadmap explicitly changes alert query support.
+3. query condition-code candidates using the same observation window;
-- JSON/XML/text format support remains unchanged.
+4. run the Go selector;
-- Response envelope remains `{ "data": ... }`.
+5. map numeric aggregate fields plus selected condition code into `app.CurrentConditions`.
-- No Postgres schema or weatherfeeder migration is required.
 
-## Stage 1: App Service Filtering
+Keep row DTOs and mappers local to the Postgres adapter. Do not move SQL or row types into `internal/app`.
 
-### Changes
+## Stage 3: Preserve API And Presentation Behavior
 
-- Keep `app.Repository.LatestAlertRun(ctx)` unchanged.
+Keep all existing `/conditions/current` API behavior except condition-code selection.
-- Add an app-level alert read use case, either:
-  - `LatestActiveAlertRun(ctx context.Context, activeAt time.Time) (*model.WeatherAlertRun, error)`, or
-  - `LatestAlerts(ctx context.Context, filter AlertFilter) (*model.WeatherAlertRun, error)` with `AlertFilter.ActiveAt`.
-- Prefer the first option unless another alert route is being added at the same time; it is narrower and clearer for the existing API.
-- Implement the new service method by:
-  - reading `s.repo.LatestAlertRun(ctx)`;
-  - returning `nil, nil` when no run exists;
-  - cloning the run before mutation;
-  - filtering cloned `Alerts` with the active predicate;
-  - returning the cloned run.
-- Add package-local helpers for:
-  - cloning `WeatherAlertRun`;
-  - cloning `WeatherAlert` values deeply enough to avoid mutating repository-owned slices;
-  - copying `References` slices;
-  - evaluating `isActiveAlert(alert, activeAt)`.
 
-### Clone Requirements
+Required invariants:
 
-The clone must protect repository-returned data from service mutation:
+- `conditionCode` remains present in JSON/XML/text responses through the existing presenter path;
+- `conditionText` continues to derive from selected `conditionCode` and `isDay`;
+- `format`, `units`, and `precision` behavior is unchanged;
+- no `tz` support is added;
+- no public response fields are added or removed.
 
-- allocate a new `Alerts` slice;
+Update existing endpoint or presenter tests only if expected condition codes need to change because of the new selector.
-- allocate new `References` slices for each alert;
-- copy pointer time fields only if the model uses pointer fields for alert timestamps;
-- preserve string, boolean, enum, and scalar values exactly.
 
-### Tests
+## Stage 4: Update Current-Behavior Documentation
 
-Add app tests covering:
+After implementation is complete, update current-behavior docs outside roadmap:
 
-- repository delegation and error propagation;
+- `docs/api.md`: current conditions aggregate numeric fields and choose `conditionCode` by source-balanced WMO family consensus;
-- `nil, nil` when the repository has no latest alert run;
+- `docs/internal/postgres-repository.md`: current conditions use an aggregate row plus a latest-per-source condition-code candidate query;
-- expired alerts are removed when `activeAt >= expires`;
+- `docs/integrations/weatherfeeder-postgres.md`: current conditions use `observations.event_source` for source-balanced condition-code selection.
-- alerts expiring exactly at `activeAt` are inactive;
-- alerts effective exactly at `activeAt` are active;
-- future-effective alerts are inactive;
-- missing `effective` does not make an otherwise valid alert inactive;
-- missing `expires` does not make an otherwise valid alert inactive;
-- `messageType=Cancel` is excluded case-insensitively;
-- alert order is preserved;
-- run metadata is preserved when all alerts are filtered out;
-- filtering does not mutate the repository-owned run, alerts, references, or timestamp pointers.
 
-### Verification
+Do not document any unimplemented options such as provider blacklists, trust weights, or source priorities.
-
+
-```sh
+## Test Plan
-go test ./internal/app
+
-```
+Selector tests:
-
+
-## Stage 2: HTTP Adapter Wiring
+- `0`, `1`, `2` returns `0` by clear/cloud ranking;
-
+- `1`, `2`, `95` returns `1` because clear/cloud family wins;
-### Changes
+- `0`, `95` returns `model.WMOUnknown` because families tie;
-
+- `61`, `63`, `80` returns `61` by rain ranking;
-- Extend `internal/adapters/inbound/httpapi.Service` with the app service method selected in Stage 1.
+- `61`, `95`, `0` returns `model.WMOUnknown` because three families tie;
-- Add adapter-local clock injection near `alerts_endpoint.go`:
+- only `95` returns `95`;
-
+- unrecognized-only candidates return `model.WMOUnknown`;
-```go
+- duplicate candidates from the same source do not produce multiple votes if the selector receives them.
-var alertNow = time.Now
+
-```
+Repository tests:
-
+
-- Update `/alerts/active` handler to call the new active-alert service method with `alertNow().UTC()`.
+- current conditions no longer chooses the highest numeric condition code;
-- Keep `bindQuery` as the binder so public query support remains `format` and `units` only.
+- latest condition-code candidate per source uses `observed_at DESC, event_emitted_at DESC`;
-- Keep the text template name `alerts_active.txt.tmpl`.
+- aggregate no-sample behavior still returns nil;
-- Do not add timezone support in this cleanup. Alert timestamp presentation currently returns canonical model timestamps; timezone support would be a separate public API expansion.
+- numeric aggregate fields, wind direction, and `isDay` mapping remain unchanged;
-
+- SQL/query errors from the candidate query include operation context.
-### Tests
+
-
+Verification commands:
-Update HTTP tests covering:
-
-- route registration remains unchanged;
-- handler passes `alertNow().UTC()` to the service;
-- JSON success response renders filtered service output;
-- text output renders zero active alerts as `Alerts: 0` when data is non-null;
-- `data: null` still renders no-data behavior;
-- `units=us` remains accepted and has no schema effect;
-- `precision`, `tz`, `TZ`, and unknown query params still return `400`.
-
-### Verification
-
-```sh
-go test ./internal/adapters/inbound/httpapi
-```
-
-## Stage 3: Presenter And Template Check
-
-### Changes
-
-- Keep `presenter.AlertsPayload` as a pass-through unless filtering requires defensive copy behavior at presentation time.
-- Do not move active filtering into the presenter.
-- Review `templates/alerts_active.txt.tmpl` and ensure it behaves correctly when `Data` is non-null and `Alerts` is empty.
-- If needed, add an explicit text fixture/assertion rather than changing template wording broadly.
-
-### Tests
-
-Add or update presenter/template-sensitive tests only if current endpoint tests do not prove:
-
-- nil data renders no-data text;
-- non-null data with empty alerts renders an active-alert run with `Alerts: 0`;
-- expired/canceled alerts do not appear in text output after service filtering.
-
-### Verification
 
 ```sh
+go test ./internal/adapters/outbound/postgres ./internal/app
 go test ./internal/adapters/inbound/httpapi ./internal/adapters/inbound/httpapi/presenter
-```
-
-## Stage 4: Documentation Updates
-
-### Changes
-
-Update current-behavior docs after implementation is complete:
-
-- `docs/api.md`:
-  - clarify that `/alerts/active` returns the latest alert run filtered to alerts active at request time;
-  - document that no current active alerts returns a run with `alerts: []` when a latest run exists;
-  - keep `data: null` limited to no stored alert run;
-  - keep supported query params as `format` and `units`.
-- `README.md` if endpoint summaries mention active alerts.
-- `docs/internal/postgres-repository.md`:
-  - clarify that `LatestAlertRun` reads the latest stored snapshot and active filtering is performed in the app service.
-- `docs/policy/architecture.md` only if its latest-resource wording needs to distinguish latest snapshots from request-time derived active views.
-
-Do not document this unimplemented behavior outside `docs/roadmap/` before the code change lands.
-
-### Tests
-
-No doc-specific tests are required unless existing docs consistency tests cover endpoint summaries.
-
-## Stage 5: Final Verification
-
-Run focused tests:
-
-```sh
-go test ./internal/app ./internal/adapters/inbound/httpapi ./internal/adapters/inbound/httpapi/presenter
-```
-
-Run the full suite:
-
-```sh
 go test ./...
 ```
 
-Manual smoke checks after deployment:
-
-```sh
-curl 'https://weather.api.rakestrawhome.com/alerts/active?format=json'
-curl 'https://weather.api.rakestrawhome.com/alerts/active?format=text'
-```
-
-Expected behavior when all alerts in the latest stored run are expired:
-
-- JSON returns a non-null `data` object with `alerts: []`.
-- Text output shows the run metadata and `Alerts: 0`.
-
-## Guardrails
-
-- Do not change weatherfeeder ingestion behavior in this cleanup.
-- Do not alter Postgres tables or SQL filtering unless a later performance issue justifies it.
-- Do not make `weatherapi` poll NWS or any upstream provider.
-- Do not rename `/alerts/active`.
-- Do not add alert history endpoints in this cleanup.
-- Do not introduce generic filtering frameworks; use small app-local helpers.
-- Do not move route query validation into the app layer.
-- Do not move active filtering into presenters or text templates.
-
 ## Assumptions
 
-- `weatherfeeder` persists alert snapshots that were active at ingestion time, but `weatherapi` must still enforce request-time active semantics.
+- `observations.event_source` is non-null in the weatherfeeder-owned schema and is safe to use as the source identity.
-- Cancellation messages are operational metadata, not active hazards, and should not be returned by `/alerts/active`.
+- The latest-per-source query can be implemented with existing Postgres features and does not require a migration.
-- Missing `expires` should not suppress an alert unless future real-world data shows this creates stale records.
+- Current conditions remain repository-owned because they are a Postgres aggregate read model; no new app service method or public interface is needed.
-- Time comparisons should use UTC instants; timezone presentation is not part of this cleanup.
+- The implementation should remain standard-library and SQL based; do not add dependencies.

examples/requests.http

@@ -15,8 +15,8 @@ GET {{baseUrl}}/alerts/active?format=text
 GET {{baseUrl}}/outlooks/convective?day=1&outlookType=categorical
 Accept: application/json
 
-### Active convective outlooks for the configured location as text
+### Active convective outlooks as text
-GET {{baseUrl}}/outlooks/convective/location?format=text&tz=CDT
+GET {{baseUrl}}/outlooks/convective/active?format=text&tz=CDT
 
 ### Hourly forecast in US units
 GET {{baseUrl}}/forecast/hourly?units=us&precision=1&tz=Chicago

go.mod

@@ -4,7 +4,7 @@ go 1.25.5
 
 require (
 	gitea.maximumdirect.net/ejr/feedapi v0.1.0
-	gitea.maximumdirect.net/ejr/weatherfeeder v0.12.0
+	gitea.maximumdirect.net/ejr/weatherfeeder v0.12.1
 	github.com/lib/pq v1.10.9
 )
 

go.sum

@@ -1,7 +1,7 @@
 gitea.maximumdirect.net/ejr/feedapi v0.1.0 h1:ZB5QWKD5DPFV3P7vyeJqXPMcSWN9qHkDUHw1LgN9hwY=
 gitea.maximumdirect.net/ejr/feedapi v0.1.0/go.mod h1:3fIaFFx4ywt0TWbN8DIIBAHJn7ZQUm6PNcceqRgy3bw=
-gitea.maximumdirect.net/ejr/weatherfeeder v0.12.0 h1:U3yln3o2rGqfMvWVRwOGgQeqYuqMm+/p0XIRhK8TDUQ=
+gitea.maximumdirect.net/ejr/weatherfeeder v0.12.1 h1:dZYDpOd0vEIk6QljsrhFyrOY0Lt4WyEoazhqDFIZKNQ=
-gitea.maximumdirect.net/ejr/weatherfeeder v0.12.0/go.mod h1:VVtuwrbddWdUu21ovCSSojhH5J9P6kk0/dfnFqC4/Lw=
+gitea.maximumdirect.net/ejr/weatherfeeder v0.12.1/go.mod h1:VVtuwrbddWdUu21ovCSSojhH5J9P6kk0/dfnFqC4/Lw=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=

internal/adapters/inbound/httpapi/endpoints_test.go

@@ -324,12 +324,14 @@ func TestObservationUSUnitsChangesFieldNames(t *testing.T) {
 }
 
 func TestAlertsUSUnitsKeepSchema(t *testing.T) {
+	ends := time.Date(2026, 6, 11, 14, 0, 0, 0, time.UTC)
 	h := newHandler(t, &fakeService{
 		alerts: &model.WeatherAlertRun{
 			AsOf: time.Now().UTC(),
 			Alerts: []model.WeatherAlert{{
 				ID:       "abc",
 				Headline: "A headline",
+				Ends:     &ends,
 			}},
 		},
 	}, "/alerts/active")
@@ -359,6 +361,9 @@ func TestAlertsUSUnitsKeepSchema(t *testing.T) {
 	if first["id"] != "abc" {
 		t.Fatalf("expected alert id abc, got %#v", first["id"])
 	}
+	if _, ok := first["ends"].(string); !ok {
+		t.Fatalf("expected alert ends string, got %#v", first["ends"])
+	}
 }
 
 func TestAlertsRouteRegistered(t *testing.T) {
@@ -456,8 +461,10 @@ func TestAlertsTextOmitsInactiveAlertsAfterServiceFiltering(t *testing.T) {
 	activeAt := time.Date(2026, 6, 11, 12, 0, 0, 0, time.UTC)
 	setAlertNowForTest(t, activeAt)
 	effective := activeAt.Add(-1 * time.Hour)
-	activeExpires := activeAt.Add(1 * time.Hour)
+	activeEnds := activeAt.Add(1 * time.Hour)
-	expiredAtBoundary := activeAt
+	expiredEndsAtBoundary := activeAt
+	expiredProviderMetadata := activeAt.Add(-30 * time.Minute)
+	activeProviderMetadata := activeAt.Add(30 * time.Minute)
 	repo := &alertRepository{
 		alerts: &model.WeatherAlertRun{
 			AsOf: activeAt,
@@ -467,21 +474,23 @@ func TestAlertsTextOmitsInactiveAlertsAfterServiceFiltering(t *testing.T) {
 					Headline:    "Active warning",
 					MessageType: "Alert",
 					Effective:   &effective,
-					Expires:     &activeExpires,
+					Ends:        &activeEnds,
+					Expires:     &expiredProviderMetadata,
 				},
 				{
 					ID:          "expired-alert",
 					Headline:    "Expired warning",
 					MessageType: "Alert",
 					Effective:   &effective,
-					Expires:     &expiredAtBoundary,
+					Ends:        &expiredEndsAtBoundary,
+					Expires:     &activeProviderMetadata,
 				},
 				{
 					ID:          "canceled-alert",
 					Headline:    "Canceled warning",
 					MessageType: " cancel ",
 					Effective:   &effective,
-					Expires:     &activeExpires,
+					Ends:        &activeEnds,
 				},
 			},
 		},
@@ -496,7 +505,7 @@ func TestAlertsTextOmitsInactiveAlertsAfterServiceFiltering(t *testing.T) {
 		t.Fatalf("expected 200, got %d", w.Code)
 	}
 	body := w.Body.String()
-	for _, want := range []string{"Alerts: 1", "active-alert", "Active warning"} {
+	for _, want := range []string{"Alerts: 1", "active-alert", "Active warning", "Ends:"} {
 		if !strings.Contains(body, want) {
 			t.Fatalf("expected %q in text body, got %q", want, body)
 		}
@@ -1484,13 +1493,15 @@ func TestOutlookRoutesRegistered(t *testing.T) {
 	for _, path := range []string{
 		"/outlooks/convective",
 		"/outlooks/convective/active",
-		"/outlooks/convective/location",
 	} {
 		def := definitionForPath(t, defs, path)
 		if len(def.Methods) != 1 || def.Methods[0] != http.MethodGet {
 			t.Fatalf("%s: expected GET definition, got %+v", path, def.Methods)
 		}
 	}
+	if endpointExists(defs, "/outlooks/convective/location") {
+		t.Fatal("expected /outlooks/convective/location to be removed")
+	}
 }
 
 func TestOutlookRoutesJSONSuccess(t *testing.T) {
@@ -1499,7 +1510,6 @@ func TestOutlookRoutesJSONSuccess(t *testing.T) {
 	for _, path := range []string{
 		"/outlooks/convective",
 		"/outlooks/convective/active",
-		"/outlooks/convective/location",
 	} {
 		t.Run(path, func(t *testing.T) {
 			h := newHandler(t, &fakeService{outlookRun: testOutlookRun()}, path)
@@ -1676,7 +1686,7 @@ func TestOutlookQueryParamsConstructFilter(t *testing.T) {
 	h := newHandler(t, svc, "/outlooks/convective")
 
 	w := httptest.NewRecorder()
-	req := httptest.NewRequest(http.MethodGet, "/outlooks/convective?day=2&outlookType=Tornado&containsLocation=true&tz=CDT&units=US", nil)
+	req := httptest.NewRequest(http.MethodGet, "/outlooks/convective?day=2&outlookType=Tornado&tz=CDT&units=US", nil)
 	h.ServeHTTP(w, req)
 
 	if w.Code != http.StatusOK {
@@ -1692,15 +1702,12 @@ func TestOutlookQueryParamsConstructFilter(t *testing.T) {
 	if filter.OutlookType != "tornado" {
 		t.Fatalf("expected outlookType tornado, got %q", filter.OutlookType)
 	}
-	if filter.ContainsLocation == nil || !*filter.ContainsLocation {
-		t.Fatalf("expected containsLocation true, got %+v", filter.ContainsLocation)
-	}
 	if filter.ActiveAt != nil {
 		t.Fatalf("expected no active filter, got %v", filter.ActiveAt)
 	}
 }
 
-func TestOutlookActiveAndLocationFiltersUseNow(t *testing.T) {
+func TestOutlookActiveFilterUsesNow(t *testing.T) {
 	now := time.Date(2026, 6, 11, 15, 30, 0, 0, time.FixedZone("CDT", -5*3600))
 	setOutlookNowForTest(t, now)
 
@@ -1716,28 +1723,6 @@ func TestOutlookActiveAndLocationFiltersUseNow(t *testing.T) {
 	if activeFilter.ActiveAt == nil || !activeFilter.ActiveAt.Equal(now.UTC()) {
 		t.Fatalf("expected activeAt %s, got %v", now.UTC(), activeFilter.ActiveAt)
 	}
-	if activeFilter.ContainsLocation != nil {
-		t.Fatalf("expected active route not to force containsLocation, got %+v", activeFilter.ContainsLocation)
-	}
-
-	locationSvc := &fakeService{outlookRun: testOutlookRun()}
-	locationHandler := newHandler(t, locationSvc, "/outlooks/convective/location")
-	w = httptest.NewRecorder()
-	req = httptest.NewRequest(http.MethodGet, "/outlooks/convective/location?outlookType=hail", nil)
-	locationHandler.ServeHTTP(w, req)
-	if w.Code != http.StatusOK {
-		t.Fatalf("expected location 200, got %d", w.Code)
-	}
-	locationFilter := locationSvc.outlookFilters[0]
-	if locationFilter.ActiveAt == nil || !locationFilter.ActiveAt.Equal(now.UTC()) {
-		t.Fatalf("expected location activeAt %s, got %v", now.UTC(), locationFilter.ActiveAt)
-	}
-	if locationFilter.ContainsLocation == nil || !*locationFilter.ContainsLocation {
-		t.Fatalf("expected location route to force containsLocation true, got %+v", locationFilter.ContainsLocation)
-	}
-	if locationFilter.OutlookType != "hail" {
-		t.Fatalf("expected outlookType hail, got %q", locationFilter.OutlookType)
-	}
 }
 
 func TestOutlookInvalidQueryParamsReturnBadRequest(t *testing.T) {
@@ -1748,10 +1733,10 @@ func TestOutlookInvalidQueryParamsReturnBadRequest(t *testing.T) {
 		"/outlooks/convective?day=4",
 		"/outlooks/convective?day=two",
 		"/outlooks/convective?outlookType=snow",
-		"/outlooks/convective?containsLocation=maybe",
+		"/outlooks/convective?containsLocation=true",
+		"/outlooks/convective/active?containsLocation=true",
 		"/outlooks/convective?tz=not-a-timezone",
 		"/outlooks/convective?tz=CDT&TZ=EST",
-		"/outlooks/convective/location?containsLocation=true",
 	} {
 		t.Run(rawURL, func(t *testing.T) {
 			h := newHandler(t, &fakeService{outlookRun: testOutlookRun()}, strings.Split(rawURL, "?")[0])
@@ -2440,6 +2425,15 @@ func definitionForPath(t *testing.T, defs []endpoint.Definition, path string) en
 	return endpoint.Definition{}
 }
 
+func endpointExists(defs []endpoint.Definition, path string) bool {
+	for _, def := range defs {
+		if def.Path == path {
+			return true
+		}
+	}
+	return false
+}
+
 func testRenderers(t *testing.T) *render.Registry {
 	t.Helper()
 
@@ -2463,7 +2457,7 @@ func testRenderers(t *testing.T) *render.Registry {
 		"outlooks_convective.txt.tmpl":     "Convective Outlook\n{{if .Data}}Outlooks: {{len .Data.Outlooks}}\nDiscussions: {{len .Data.Discussions}}{{range .Data.Discussions}}\nDiscussion: {{.Discussion}}{{end}}{{else}}No convective outlook data available.{{end}}",
 		"weatherstories.txt.tmpl":          "Weather Stories",
 		"weatherstories_latest.txt.tmpl":   "Latest Weather Story",
-		"alerts_active.txt.tmpl":           "{{if .Data}}Active Alerts\nAlerts: {{len .Data.Alerts}}{{range .Data.Alerts}}\n{{.ID}}{{if .Headline}}\nHeadline: {{.Headline}}{{end}}{{end}}{{else}}No active alerts data available.{{end}}",
+		"alerts_active.txt.tmpl":           "{{if .Data}}Active Alerts\nAlerts: {{len .Data.Alerts}}{{range .Data.Alerts}}\n{{.ID}}{{if .Headline}}\nHeadline: {{.Headline}}{{end}}{{if .Ends}}\nEnds: {{.Ends}}{{end}}{{end}}{{else}}No active alerts data available.{{end}}",
 		"conditions_current.txt.tmpl":      "Conditions text",
 	} {
 		tmpl, err := template.New(name).Parse(body)

internal/adapters/inbound/httpapi/outlooks_endpoint.go

@@ -18,7 +18,6 @@ type outlookFilterMode int
 const (
 	outlookFilterUser outlookFilterMode = iota
 	outlookFilterActive
-	outlookFilterLocation
 )
 
 var outlookNow = time.Now
@@ -27,7 +26,6 @@ func outlookDefinitions(svc Service) []endpoint.Definition {
 	return []endpoint.Definition{
 		outlookDefinition("/outlooks/convective", outlookFilterUser, bindOutlookQuery, svc),
 		outlookDefinition("/outlooks/convective/active", outlookFilterActive, bindOutlookQuery, svc),
-		outlookDefinition("/outlooks/convective/location", outlookFilterLocation, bindOutlookLocationQuery, svc),
 	}
 }
 
@@ -42,14 +40,10 @@ func outlookDefinition(
 		binder,
 		func(ctx context.Context, req outlookQueryRequest) (any, error) {
 			filter := req.Filter
-			if mode == outlookFilterActive || mode == outlookFilterLocation {
+			if mode == outlookFilterActive {
 				activeAt := outlookNow().UTC()
 				filter.ActiveAt = &activeAt
 			}
-			if mode == outlookFilterLocation {
-				containsLocation := true
-				filter.ContainsLocation = &containsLocation
-			}
 
 			run, err := svc.LatestConvectiveOutlook(ctx, filter)
 			if err != nil {

internal/adapters/inbound/httpapi/query_bind.go

@@ -145,29 +145,16 @@ func bindPrecisionQueryInternal(r *http.Request, allowTimezone bool) (precisionQ
 }
 
 func bindOutlookQuery(r *http.Request) (outlookQueryRequest, error) {
-	return bindOutlookQueryInternal(r, true)
-}
-
-func bindOutlookLocationQuery(r *http.Request) (outlookQueryRequest, error) {
-	return bindOutlookQueryInternal(r, false)
-}
-
-func bindOutlookQueryInternal(r *http.Request, allowContainsLocation bool) (outlookQueryRequest, error) {
 	normalizeCommonQueryValue(r, "units")
 	normalizeCommonQueryValue(r, "format")
 	normalizeCommonQueryValue(r, "outlookType")
 
-	allowedExtra := []string{"tz", "TZ", "day", "outlookType"}
-	if allowContainsLocation {
-		allowedExtra = append(allowedExtra, "containsLocation")
-	}
-
 	common, err := bind.CommonQueryParams(r, bind.QueryPolicy{
 		AllowUnits:    true,
 		AllowFormat:   true,
 		DefaultUnits:  string(presenter.UnitsMetric),
 		RejectUnknown: true,
-	}, allowedExtra...)
+	}, "tz", "TZ", "day", "outlookType")
 	if err != nil {
 		return outlookQueryRequest{}, err
 	}
@@ -182,7 +169,7 @@ func bindOutlookQueryInternal(r *http.Request, allowContainsLocation bool) (outl
 		return outlookQueryRequest{}, err
 	}
 
-	filter, err := bindOutlookFilter(r, allowContainsLocation)
+	filter, err := bindOutlookFilter(r)
 	if err != nil {
 		return outlookQueryRequest{}, err
 	}
@@ -194,7 +181,7 @@ func bindOutlookQueryInternal(r *http.Request, allowContainsLocation bool) (outl
 	}, nil
 }
 
-func bindOutlookFilter(r *http.Request, allowContainsLocation bool) (app.OutlookFilter, error) {
+func bindOutlookFilter(r *http.Request) (app.OutlookFilter, error) {
 	var filter app.OutlookFilter
 
 	if strings.TrimSpace(r.URL.Query().Get("day")) != "" {
@@ -218,16 +205,5 @@ func bindOutlookFilter(r *http.Request, allowContainsLocation bool) (app.Outlook
 		}
 	}
 
-	if strings.TrimSpace(r.URL.Query().Get("containsLocation")) != "" {
-		if !allowContainsLocation {
-			return app.OutlookFilter{}, apierrors.InvalidParameter("containsLocation is not allowed on this endpoint")
-		}
-		containsLocation, err := bind.OptionalBool(r, "containsLocation", false)
-		if err != nil {
-			return app.OutlookFilter{}, err
-		}
-		filter.ContainsLocation = &containsLocation
-	}
-
 	return filter, nil
 }

internal/adapters/outbound/postgres/alerts_mapper.go

@@ -33,6 +33,7 @@ func mapAlertRow(row alertRow) indexedAlert {
 			Sent:            timePtr(row.Sent),
 			Effective:       timePtr(row.Effective),
 			Onset:           timePtr(row.Onset),
+			Ends:            timePtr(row.Ends),
 			Expires:         timePtr(row.Expires),
 			AreaDescription: stringValue(row.AreaDescription),
 			SenderName:      stringValue(row.SenderName),

internal/adapters/outbound/postgres/alerts_queries.go

@@ -33,6 +33,7 @@ SELECT
   sent,
   effective,
   onset,
+  ends,
   expires,
   area_description,
   sender_name

internal/adapters/outbound/postgres/alerts_read.go

@@ -70,6 +70,7 @@ func (r *Repository) loadAlerts(ctx context.Context, eventID string) ([]model.We
 			&row.Sent,
 			&row.Effective,
 			&row.Onset,
+			&row.Ends,
 			&row.Expires,
 			&row.AreaDescription,
 			&row.SenderName,

internal/adapters/outbound/postgres/alerts_rows.go

@@ -35,6 +35,7 @@ type alertRow struct {
 	Sent            sql.NullTime
 	Effective       sql.NullTime
 	Onset           sql.NullTime
+	Ends            sql.NullTime
 	Expires         sql.NullTime
 	AreaDescription sql.NullString
 	SenderName      sql.NullString

internal/adapters/outbound/postgres/repository_test.go

@@ -246,6 +246,36 @@ func TestAttachAlertReferencesPreservesOrder(t *testing.T) {
 	}
 }
 
+func TestMapAlertRowMapsEndsAndExpires(t *testing.T) {
+	ends := time.Date(2026, 6, 16, 14, 0, 0, 0, time.FixedZone("CDT", -5*3600))
+	expires := time.Date(2026, 6, 16, 11, 0, 0, 0, time.FixedZone("CDT", -5*3600))
+
+	alert := mapAlertRow(alertRow{
+		AlertIndex: 1,
+		AlertID:    "alert-1",
+		Ends:       sql.NullTime{Time: ends, Valid: true},
+		Expires:    sql.NullTime{Time: expires, Valid: true},
+	}).Alert
+
+	if alert.Ends == nil || alert.Ends.Location().String() != "UTC" || !alert.Ends.Equal(ends.UTC()) {
+		t.Fatalf("expected ends UTC %s, got %v", ends.UTC(), alert.Ends)
+	}
+	if alert.Expires == nil || alert.Expires.Location().String() != "UTC" || !alert.Expires.Equal(expires.UTC()) {
+		t.Fatalf("expected expires UTC %s, got %v", expires.UTC(), alert.Expires)
+	}
+}
+
+func TestMapAlertRowNullableEnds(t *testing.T) {
+	alert := mapAlertRow(alertRow{
+		AlertIndex: 1,
+		AlertID:    "alert-1",
+	}).Alert
+
+	if alert.Ends != nil {
+		t.Fatalf("expected nil ends, got %v", alert.Ends)
+	}
+}
+
 func TestMapCurrentConditionsRowNoSamplesReturnsNil(t *testing.T) {
 	got := mapCurrentConditionsRow(currentConditionsRow{
 		SampleCount: 0,

internal/app/service.go

@@ -10,6 +10,8 @@ import (
 	"gitea.maximumdirect.net/ejr/weatherfeeder/model"
 )
 
+const nwsAlertURLPrefix = "https://api.weather.gov/alerts/"
+
 // Repository defines outbound data access used by weatherapi use cases.
 type Repository interface {
 	LatestObservation(ctx context.Context) (*model.WeatherObservation, error)
@@ -27,7 +29,6 @@ type Repository interface {
 type OutlookFilter struct {
 	Day         *int
 	OutlookType string
-	ContainsLocation *bool
 	ActiveAt    *time.Time
 }
 
@@ -78,9 +79,10 @@ func (s *Service) LatestActiveAlertRun(ctx context.Context, activeAt time.Time)
 	}
 
 	out := cloneAlertRun(run)
+	supersededIDs := collectSupersededAlertIDs(out.Alerts)
 	alerts := out.Alerts[:0]
 	for _, alert := range out.Alerts {
-		if isActiveAlert(alert, activeAt) {
+		if isActiveAlert(alert, activeAt) && !isSupersededAlert(alert, supersededIDs) {
 			alerts = append(alerts, alert)
 		}
 	}
@@ -120,9 +122,6 @@ func matchesOutlookFilter(outlook model.WeatherOutlook, filter OutlookFilter) bo
 	if filter.OutlookType != "" && outlook.OutlookType != normalizeOutlookType(filter.OutlookType) {
 		return false
 	}
-	if filter.ContainsLocation != nil && outlook.ContainsLocation != *filter.ContainsLocation {
-		return false
-	}
 	if filter.ActiveAt != nil && (filter.ActiveAt.Before(outlook.ValidFrom) || !filter.ActiveAt.Before(outlook.ValidTo)) {
 		return false
 	}
@@ -151,6 +150,7 @@ func cloneAlert(alert model.WeatherAlert) model.WeatherAlert {
 	out.Sent = copyTime(alert.Sent)
 	out.Effective = copyTime(alert.Effective)
 	out.Onset = copyTime(alert.Onset)
+	out.Ends = copyTime(alert.Ends)
 	out.Expires = copyTime(alert.Expires)
 	if alert.References != nil {
 		out.References = make([]model.AlertReference, len(alert.References))
@@ -174,12 +174,51 @@ func isActiveAlert(alert model.WeatherAlert, activeAt time.Time) bool {
 	if alert.Effective != nil && activeAt.Before(*alert.Effective) {
 		return false
 	}
-	if alert.Expires != nil && !activeAt.Before(*alert.Expires) {
+	endBoundary := alert.Ends
+	if endBoundary == nil {
+		endBoundary = alert.Expires
+	}
+	if endBoundary != nil && !activeAt.Before(*endBoundary) {
 		return false
 	}
 	return true
 }
 
+func collectSupersededAlertIDs(alerts []model.WeatherAlert) map[string]struct{} {
+	supersededIDs := make(map[string]struct{})
+	for _, alert := range alerts {
+		for _, ref := range alert.References {
+			id := normalizeAlertID(referenceAlertID(ref))
+			if id != "" {
+				supersededIDs[id] = struct{}{}
+			}
+		}
+	}
+	return supersededIDs
+}
+
+func isSupersededAlert(alert model.WeatherAlert, supersededIDs map[string]struct{}) bool {
+	id := normalizeAlertID(alert.ID)
+	if id == "" {
+		return false
+	}
+	_, ok := supersededIDs[id]
+	return ok
+}
+
+func referenceAlertID(ref model.AlertReference) string {
+	if strings.TrimSpace(ref.Identifier) != "" {
+		return ref.Identifier
+	}
+	return ref.ID
+}
+
+func normalizeAlertID(value string) string {
+	value = strings.TrimSpace(value)
+	value = strings.TrimPrefix(value, nwsAlertURLPrefix)
+	return value
+}
+
 func cloneOutlookRun(run *model.WeatherOutlookRun) *model.WeatherOutlookRun {
 	out := *run
 	out.Latitude = copyFloat64(run.Latitude)

internal/app/service_test.go

@@ -132,7 +132,7 @@ func TestServiceLatestActiveAlertRunDelegatesAndFilters(t *testing.T) {
 	if repo.alertRunCalls != 1 {
 		t.Fatalf("expected one repository call, got %d", repo.alertRunCalls)
 	}
-	assertAlertIDs(t, run, []string{"current", "effective-at-boundary", "missing-effective", "missing-expires", "later-onset"})
+	assertAlertIDs(t, run, []string{"current", "effective-at-boundary", "missing-effective", "missing-expires", "later-onset", "ends-preferred"})
 }
 
 func TestServiceLatestActiveAlertRunNoData(t *testing.T) {
@@ -165,9 +165,9 @@ func TestServiceLatestActiveAlertRunPropagatesErrors(t *testing.T) {
 func TestServiceLatestActiveAlertRunKeepsMetadataWithEmptyAlerts(t *testing.T) {
 	activeAt := testTime(12)
 	repo := &fakeRepository{alerts: testAlertRunWithAlerts([]model.WeatherAlert{
-		testAlert("expired", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(12)),
+		testAlert("expired", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(12), testTimePtr(13)),
-		testAlert("cancel", "Cancel", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(13)),
+		testAlert("cancel", "Cancel", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(13), testTimePtr(13)),
-		testAlert("future", "Alert", testTimePtr(9), testTimePtr(13), testTimePtr(13), testTimePtr(14)),
+		testAlert("future", "Alert", testTimePtr(9), testTimePtr(13), testTimePtr(13), testTimePtr(14), testTimePtr(14)),
 	})}
 	svc := NewService(repo)
 
@@ -213,7 +213,8 @@ func TestServiceLatestActiveAlertRunDoesNotMutateRepositoryRun(t *testing.T) {
 	*run.Alerts[0].Sent = testTime(1)
 	*run.Alerts[0].Effective = testTime(2)
 	*run.Alerts[0].Onset = testTime(3)
-	*run.Alerts[0].Expires = testTime(4)
+	*run.Alerts[0].Ends = testTime(4)
+	*run.Alerts[0].Expires = testTime(5)
 	*run.Alerts[0].References[0].Sent = testTime(5)
 	run.Alerts[0].ID = "changed"
 	run.Alerts[0].References[0].ID = "changed"
@@ -237,7 +238,10 @@ func TestServiceLatestActiveAlertRunDoesNotMutateRepositoryRun(t *testing.T) {
 	if original.Alerts[0].Onset == nil || !original.Alerts[0].Onset.Equal(testTime(11)) {
 		t.Fatalf("expected original onset unchanged, got %v", original.Alerts[0].Onset)
 	}
-	if original.Alerts[0].Expires == nil || !original.Alerts[0].Expires.Equal(testTime(13)) {
+	if original.Alerts[0].Ends == nil || !original.Alerts[0].Ends.Equal(testTime(13)) {
+		t.Fatalf("expected original ends unchanged, got %v", original.Alerts[0].Ends)
+	}
+	if original.Alerts[0].Expires == nil || !original.Alerts[0].Expires.Equal(testTime(12)) {
 		t.Fatalf("expected original expires unchanged, got %v", original.Alerts[0].Expires)
 	}
 	if original.Alerts[0].References[0].ID != "ref-current" {
@@ -246,11 +250,82 @@ func TestServiceLatestActiveAlertRunDoesNotMutateRepositoryRun(t *testing.T) {
 	if original.Alerts[0].References[0].Sent == nil || !original.Alerts[0].References[0].Sent.Equal(testTime(8)) {
 		t.Fatalf("expected original reference sent unchanged, got %v", original.Alerts[0].References[0].Sent)
 	}
-	if len(original.Alerts) != 8 {
+	if len(original.Alerts) != 10 {
 		t.Fatalf("expected original alert slice unchanged, got %d entries", len(original.Alerts))
 	}
 }
 
+func TestServiceLatestActiveAlertRunUsesEndsBeforeExpires(t *testing.T) {
+	activeAt := testTime(12)
+	repo := &fakeRepository{alerts: testAlertRunWithAlerts([]model.WeatherAlert{
+		testAlert("ends-at-boundary", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(12), testTimePtr(13)),
+		testAlert("ends-after-active-expires-before", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(13), testTimePtr(11)),
+		testAlert("expires-fallback", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), nil, testTimePtr(13)),
+		testAlert("expires-fallback-expired", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), nil, testTimePtr(12)),
+	})}
+	svc := NewService(repo)
+
+	run, err := svc.LatestActiveAlertRun(context.Background(), activeAt)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	assertAlertIDs(t, run, []string{"ends-after-active-expires-before", "expires-fallback"})
+}
+
+func TestServiceLatestActiveAlertRunSuppressesReferencedOriginal(t *testing.T) {
+	activeAt := testTime(12)
+	original := testAlert("https://api.weather.gov/alerts/urn:oid:original", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(13), testTimePtr(13))
+	update := testAlert("https://api.weather.gov/alerts/urn:oid:update", "Update", testTimePtr(11), testTimePtr(11), nil, testTimePtr(13), testTimePtr(13))
+	update.References = []model.AlertReference{{Identifier: "urn:oid:original"}}
+	unrelated := testAlert("https://api.weather.gov/alerts/urn:oid:unrelated", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(13), testTimePtr(13))
+	repo := &fakeRepository{alerts: testAlertRunWithAlerts([]model.WeatherAlert{original, update, unrelated})}
+	svc := NewService(repo)
+
+	run, err := svc.LatestActiveAlertRun(context.Background(), activeAt)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	assertAlertIDs(t, run, []string{
+		"https://api.weather.gov/alerts/urn:oid:update",
+		"https://api.weather.gov/alerts/urn:oid:unrelated",
+	})
+}
+
+func TestServiceLatestActiveAlertRunCancelSuppressesReferencedOriginal(t *testing.T) {
+	activeAt := testTime(12)
+	original := testAlert("https://api.weather.gov/alerts/urn:oid:original", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(13), testTimePtr(13))
+	cancel := testAlert("https://api.weather.gov/alerts/urn:oid:cancel", "Cancel", testTimePtr(11), testTimePtr(11), nil, testTimePtr(13), testTimePtr(13))
+	cancel.References = []model.AlertReference{{Identifier: "urn:oid:original"}}
+	repo := &fakeRepository{alerts: testAlertRunWithAlerts([]model.WeatherAlert{original, cancel})}
+	svc := NewService(repo)
+
+	run, err := svc.LatestActiveAlertRun(context.Background(), activeAt)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	assertAlertIDs(t, run, []string{})
+}
+
+func TestServiceLatestActiveAlertRunReferenceIdentifierPrecedenceAndIDFallback(t *testing.T) {
+	activeAt := testTime(12)
+	fromID := testAlert("urn:oid:from-id", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(13), testTimePtr(13))
+	fromIdentifier := testAlert("urn:oid:from-identifier", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(13), testTimePtr(13))
+	idFallback := testAlert("urn:oid:id-fallback", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(13), testTimePtr(13))
+	update := testAlert("urn:oid:update", "Update", testTimePtr(11), testTimePtr(11), nil, testTimePtr(13), testTimePtr(13))
+	update.References = []model.AlertReference{
+		{ID: "urn:oid:from-id", Identifier: "urn:oid:from-identifier"},
+		{ID: "urn:oid:id-fallback"},
+	}
+	repo := &fakeRepository{alerts: testAlertRunWithAlerts([]model.WeatherAlert{fromID, fromIdentifier, idFallback, update})}
+	svc := NewService(repo)
+
+	run, err := svc.LatestActiveAlertRun(context.Background(), activeAt)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	assertAlertIDs(t, run, []string{"urn:oid:from-id", "urn:oid:update"})
+}
+
 func TestServiceDelegatesLatestConvectiveOutlookRun(t *testing.T) {
 	repo := &fakeRepository{outlookRun: testOutlookRun()}
 	svc := NewService(repo)
@@ -358,32 +433,6 @@ func TestServiceLatestConvectiveOutlookFiltersByOutlookType(t *testing.T) {
 	assertDiscussionDays(t, run, []int{1})
 }
 
-func TestServiceLatestConvectiveOutlookFiltersByContainsLocation(t *testing.T) {
-	containsLocation := true
-	repo := &fakeRepository{outlookRun: testOutlookRun()}
-	svc := NewService(repo)
-
-	run, err := svc.LatestConvectiveOutlook(context.Background(), OutlookFilter{ContainsLocation: &containsLocation})
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-	assertOutlookIDs(t, run, []string{"cat-1", "tor-1", "day-2"})
-	assertDiscussionDays(t, run, []int{1, 2})
-}
-
-func TestServiceLatestConvectiveOutlookContainsLocationFalseReturnsEmptyRun(t *testing.T) {
-	containsLocation := false
-	repo := &fakeRepository{outlookRun: testOutlookRun()}
-	svc := NewService(repo)
-
-	run, err := svc.LatestConvectiveOutlook(context.Background(), OutlookFilter{ContainsLocation: &containsLocation})
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
-	assertOutlookIDs(t, run, nil)
-	assertDiscussionDays(t, run, nil)
-}
-
 func TestServiceLatestConvectiveOutlookFiltersByActiveAt(t *testing.T) {
 	activeAt := time.Date(2026, 6, 11, 15, 0, 0, 0, time.UTC)
 	repo := &fakeRepository{outlookRun: testOutlookRun()}
@@ -399,7 +448,6 @@ func TestServiceLatestConvectiveOutlookFiltersByActiveAt(t *testing.T) {
 
 func TestServiceLatestConvectiveOutlookCombinesFilters(t *testing.T) {
 	day := 1
-	containsLocation := true
 	activeAt := time.Date(2026, 6, 11, 15, 0, 0, 0, time.UTC)
 	repo := &fakeRepository{outlookRun: testOutlookRun()}
 	svc := NewService(repo)
@@ -407,7 +455,6 @@ func TestServiceLatestConvectiveOutlookCombinesFilters(t *testing.T) {
 	run, err := svc.LatestConvectiveOutlook(context.Background(), OutlookFilter{
 		Day:         &day,
 		OutlookType: "categorical",
-		ContainsLocation: &containsLocation,
 		ActiveAt:    &activeAt,
 	})
 	if err != nil {
@@ -537,14 +584,16 @@ func TestServicePropagatesErrors(t *testing.T) {
 
 func testAlertRun() *model.WeatherAlertRun {
 	return testAlertRunWithAlerts([]model.WeatherAlert{
-		testAlert("current", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(13)),
+		testAlert("current", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(13), testTimePtr(12)),
-		testAlert("expired", "Update", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(12)),
+		testAlert("expired", "Update", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(12), testTimePtr(13)),
-		testAlert("future-effective", "Alert", testTimePtr(9), testTimePtr(13), testTimePtr(13), testTimePtr(15)),
+		testAlert("future-effective", "Alert", testTimePtr(9), testTimePtr(13), testTimePtr(13), testTimePtr(15), testTimePtr(15)),
-		testAlert("canceled", " cancel ", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(13)),
+		testAlert("canceled", " cancel ", testTimePtr(9), testTimePtr(10), testTimePtr(11), testTimePtr(13), testTimePtr(13)),
-		testAlert("effective-at-boundary", "Alert", testTimePtr(9), testTimePtr(12), testTimePtr(12), testTimePtr(14)),
+		testAlert("effective-at-boundary", "Alert", testTimePtr(9), testTimePtr(12), testTimePtr(12), testTimePtr(14), testTimePtr(14)),
-		testAlert("missing-effective", "Alert", testTimePtr(9), nil, nil, testTimePtr(14)),
+		testAlert("missing-effective", "Alert", testTimePtr(9), nil, nil, testTimePtr(14), testTimePtr(14)),
-		testAlert("missing-expires", "Alert", testTimePtr(9), testTimePtr(10), nil, nil),
+		testAlert("missing-expires", "Alert", testTimePtr(9), testTimePtr(10), nil, nil, nil),
-		testAlert("later-onset", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(13), testTimePtr(14)),
+		testAlert("later-onset", "Alert", testTimePtr(9), testTimePtr(10), testTimePtr(13), testTimePtr(14), testTimePtr(14)),
+		testAlert("ends-preferred", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(14), testTimePtr(11)),
+		testAlert("ends-at-boundary", "Alert", testTimePtr(9), testTimePtr(10), nil, testTimePtr(12), testTimePtr(14)),
 	})
 }
 
@@ -561,7 +610,7 @@ func testAlertRunWithAlerts(alerts []model.WeatherAlert) *model.WeatherAlertRun
 	}
 }
 
-func testAlert(id string, messageType string, sent *time.Time, effective *time.Time, onset *time.Time, expires *time.Time) model.WeatherAlert {
+func testAlert(id string, messageType string, sent *time.Time, effective *time.Time, onset *time.Time, ends *time.Time, expires *time.Time) model.WeatherAlert {
 	refSent := testTime(8)
 	return model.WeatherAlert{
 		ID:              id,
@@ -579,6 +628,7 @@ func testAlert(id string, messageType string, sent *time.Time, effective *time.T
 		Sent:            sent,
 		Effective:       effective,
 		Onset:           onset,
+		Ends:            ends,
 		Expires:         expires,
 		AreaDescription: "St. Louis City",
 		SenderName:      "NWS St. Louis",

templates/alerts_active.txt.tmpl

@@ -11,6 +11,9 @@ Headline: {{$alert.Headline}}
 {{- if $alert.Severity}}
 Severity: {{$alert.Severity}}
 {{- end}}
+{{- if $alert.Ends}}
+Ends: {{$alert.Ends}}
+{{- end}}
 {{- if $alert.Expires}}
 Expires: {{$alert.Expires}}
 {{- end}}