missions/_docs/01_solution/solution.md

Solution — Azaion.Missions

Status: derived-from-code (autodev /document Step 5, 2026-05-14). Mode: retrospective synthesis from the verified _docs/02_document/ set. Forward-looking caveat: this document describes the post-rename, post-GPS-Denied-removal target the documentation already reflects. Today's source still uses Azaion.Flights.*, Aircraft*/Flight*/Orthophoto*/GpsCorrection* filenames, and [Route("aircrafts"|"flights")]. The implementation gap is tracked under Jira AZ-EPIC (AZ-539) children B4–B12; the doc-vs-code reconciliation table lives in _docs/02_document/04_verification_log.md § 0. References to "the implemented solution" in this document mean the code as it exists today plus the deltas closed by B4–B12.

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1. Product Solution Description

missions is the edge-tier .NET 10 REST service that owns the mission domain of an Azaion deployment — vehicle inventory (Plane / Copter / UGV / GuidedMissile), mission plans, ordered waypoints, and the cross-service cascade-delete that keeps the rest of the edge stack consistent when missions or waypoints are removed.

Runtime topology: exactly one container per device (Jetson Orin / OrangePI / operator-PC), co-located with annotations, the detection pipeline, autopilot, gps-denied, and the React ui. All edge services share one local PostgreSQL on the device; each migrates and writes only the tables it owns. JWTs are minted by the central admin service and validated locally with a shared HMAC secret — missions never calls back.

Component interaction (high-level)

flowchart LR
  ui[[Operator UI]]
  admin[[admin service<br/>JWT issuer]]
  autopilot[[autopilot]]
  annotations[[annotations]]
  detection[[detection pipeline]]
  gps[[gps-denied service]]

  subgraph missions["missions (this service, one .NET process)"]
    direction TB
    h07[07_host<br/>Program.cs / DI / startup]
    c01[01_vehicle_catalog]
    c02[02_mission_planning]
    p04[04_persistence<br/>AppDataConnection + Migrator]
    i05[05_identity<br/>JWT bearer + FL policy]
    h06[06_http_conventions<br/>error envelope + pagination]
  end

  pg[(postgres-local<br/>shared per device)]

  ui -- "REST + JWT" --> c01
  ui -- "REST + JWT" --> c02
  admin -. "shared HMAC secret (token only)" .-> i05
  c01 --> p04
  c02 --> p04
  c02 -. "cross-service cascade delete" .-> annotations
  c02 -. "cross-service cascade delete" .-> detection
  autopilot <-- "DB read missions/waypoints<br/>DB write map_objects" --> pg
  p04 --> pg
  annotations <--> pg
  detection <--> pg
  gps -. "no runtime coupling<br/>(GUID refs only)" .-> pg

  h07 --> c01
  h07 --> c02
  h07 --> p04
  h07 --> i05
  h07 --> h06

The HTTP surface is summarised in _docs/02_document/system-flows.md (7 flows, F1–F7); the per-component HTTP routes are listed in _docs/02_document/components/0[1,2]_*/description.md.

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2. Architecture (as implemented)

The dominant pattern is thin ASP.NET Core controller → service class → linq2db active-record over a per-request scoped DataConnection, with no repository abstraction and no in-process message queue / event bus. ADR rationale (ADR-001 .. ADR-008) is in _docs/02_document/architecture.md § 8.

2.1 Per-component solution table

#	Component	Solution (what it does)	Tools / libs	Advantages	Limitations	Requirements satisfied	Security	Cost	Fit
01	01_vehicle_catalog	Vehicle CRUD + is_default exclusivity. Controller [Authorize(Policy="FL")] → VehicleService → ITable<Vehicle>	ASP.NET Core, linq2db ITable<Vehicle>, [Authorize]	Single owner of the inventory abstraction; same exact pattern as 02_mission_planning so engineers context-switch cheaply	"Exactly one default" is enforced by clear-then-set without a transaction → race window (B12 decision pending); no input validation on Name/BatteryCapacity (carry-forward)	Spec § 6.1 (Vehicle Catalog), suite roles FL	[Authorize(Policy="FL")] on every action; no per-method authz	One service file + one controller (~190 LoC together)	Good — matches operator-paced load, vertical scale only
02	02_mission_planning	Mission + Waypoint CRUD + the cross-service cascade-delete walk. Existence-checks vehicle_id on create/update; paginates GET /missions (the only paginated endpoint).	ASP.NET Core, linq2db, PaginatedResponse<T> (06_http_conventions)	One canonical place that knows the full mission ownership graph; cascade walks map_objects → media → annotations → detection → waypoints → missions in FK order	Cascade is NOT transaction-wrapped (ADR-006) → partial failure leaves orphans; UpdateWaypoint is a full overwrite even though DTO looks partial; vehicle_id missing returns 400 (spec wants 404); LinqToDB does not eager-load [Association] so Vehicle and Waypoints serialize null/empty	Spec § 6.2 (Mission Planning + Waypoints), spec § cascade contract	[Authorize(Policy="FL")] on every action; no audit log, no correlation id	Two service files + one controller (~370 LoC together); sequential I/O (4–7 round-trips per cascade) — single-digit ms typical against local Postgres	Acceptable today; will need transaction wrap (one-line) before SLO commitments
04	04_persistence	AppDataConnection : DataConnection exposes ITable<T> for every persisted entity (4 owned post-B7+B9 + 3 borrowed read-only stubs). DatabaseMigrator runs CREATE TABLE IF NOT EXISTS + CREATE INDEX IF NOT EXISTS at startup; B9 adds a one-shot DROP TABLE IF EXISTS orthophotos / gps_corrections for fielded devices	linq2db 6.2.0, Npgsql 10.0.2, raw Execute for DDL	Lightweight; no migration tool dependency; idempotent every restart; ITable<T> lets cross-component reads/cascades stay typed	No schema versioning; column drops / type changes need manual SQL or a future migration tool; no connection-pool tuning beyond Npgsql defaults	Spec § database schema, suite ER diagram (post-B7)	DB credentials are env-driven (DATABASE_URL); no column-level encryption; relies on PG-level access control	One file for the connection (~70 LoC) + one for the migrator (~120 LoC post-B9)	Good for current schema scale (4 owned tables); will become limiting when schema starts evolving frequently
05	05_identity	JwtExtensions.AddJwtAuth registers JwtBearer with HMAC-SHA256 + the named policy "FL" (1-min clock skew). Validation is local; this service never calls admin	Microsoft.AspNetCore.Authentication.JwtBearer 10.0.5, SymmetricSecurityKey	admin outage does NOT take this service down (until tokens expire); zero-trip auth = lowest possible auth latency	iss / aud validation disabled (CMMC L2 row 3, AZ-487 / AZ-494 — suite-tracked, NOT in this Epic); the policy code "FL" retains the legacy "Flight" wording even after the service rename (fleet-wide auth change deferred); user-id claim is parsed but not consumed anywhere (no per-user audit)	Spec § auth, ../../suite/_docs/00_roles_permissions.md	Shared HMAC secret (JWT_SECRET); rotation requires coordinated re-deploy across every backend that shares the secret	One file (~60 LoC)	Good for the deployment shape (closed edge network behind a reverse proxy); iss/aud gap is a documented and tracked finding
06	06_http_conventions	ErrorHandlingMiddleware (global exception → JSON envelope) + PaginatedResponse<T> + the dead ErrorResponse DTO	ASP.NET Core middleware, System.Text.Json (defaults)	Single chokepoint for HTTP wire shape — error mapping is uniform across components	Two divergences from the suite spec carry forward (ADR-002): entity/DTO bodies are PascalCase (no JsonNamingPolicy.CamelCase); error envelope misses spec's errors field. The error envelope IS already camelCase by accidental match (anonymous-object literal). The ErrorResponse DTO is dead on the wire and has the wrong shape (List<string>? instead of spec's object? keyed by field name)	Spec § Error Response Format, § Pagination	LogError(ex, ...) only — no PII redaction (none in payload today); fallback 500 body shows the generic message, NOT the stack trace (logged only)	One middleware file + two DTO files (~80 LoC together)	Acceptable until the suite-wide camelCase migration; cutover is all-or-nothing because UI + autopilot consume PascalCase today
07	07_host	Program.cs composition root: env → connection string adapter, JWT registration, scoped DI for AppDataConnection + service classes, run migrator at startup, mount middleware in correct order, MapGet("/health"), mount Swagger	ASP.NET Core minimal host APIs	One file you can read top-to-bottom in one sitting; environment-fallback adapter (ConvertPostgresUrl) makes dotnet run zero-config in dev	Swagger UI + dev fallbacks are NOT gated on IsDevelopment() (ADR-005) — a misconfigured production deploy silently boots with JWT_SECRET=development-secret-key-min-32-chars!!; CORS is AllowAnyOrigin/Method/Header in every environment (assumed safe behind suite reverse proxy)	Spec § service composition; container EXPOSE 8080; Watchtower restart contract	Hardcoded dev fallbacks for JWT_SECRET / DATABASE_URL (security finding tracked at suite level)	One file (~150 LoC)	Acceptable in the closed edge environment; the unconditional Swagger + dev fallbacks are debt that should be paid when the service moves to a less trusted network

2.2 Cross-cutting design choices

Choice	Rationale	Status
One PostgreSQL per device, shared by all edge services (ADR-001)	6× operational overhead saved per device; cross-service cascade is physically possible in one DB connection	Implemented
Manual cascade-delete in code, NOT ON DELETE CASCADE (ADR-003)	Schema-level cascade would couple annotations / detection schemas to this service's lifecycle	Implemented (transaction-wrap missing — ADR-006 carry-forward)
CREATE TABLE IF NOT EXISTS schema bootstrap (ADR-004), no migration tool	4-table schema; no column drops or type changes; restart-driven deploy via Watchtower	Implemented (B9 adds the one explicit DROP TABLE IF EXISTS block for fielded devices)
Local JWT validation, no callback to admin (ADR-005, F5)	Zero auth-related coupling at runtime; admin outage doesn't take this service down	Implemented (iss/aud validation disabled — suite-tracked)
One csproj, one root namespace (ADR-008); layering by convention not by compiler	Service is small enough that 6 csprojs add more navigation cost than safety value	Implemented (post-B5); enforcement via module-layout.md § Allowed Dependencies + /code-review Phase 7
GPS-Denied moved to a sibling service (ADR-007, B7+B9)	Different scaling + deployment cadence; GPS-Denied owns its tables and lifecycle	Doc-only today; B7 (code) + B9 (DB migration) close the gap

2.3 Implementation order (relative to other components)

The 6 components have no circular dependencies. Implementation/refactor order (lowest layer first), per _docs/02_document/module-layout.md:

1. 04_persistence (Layer 1) — depends only on linq2db + Npgsql.
2. 05_identity, 06_http_conventions (Layer 2) — depend on ASP.NET Core only.
3. 01_vehicle_catalog (Layer 3) — depends on 04_persistence, 05_identity.
4. 02_mission_planning (Layer 4) — depends on 01_vehicle_catalog (vehicle existence check), 04_persistence, 05_identity, 06_http_conventions (paginated envelope).
5. 07_host (Layer 5) — depends on every other component (composition root).

Cross-component reads happen via the shared AppDataConnection (e.g. 02_mission_planning reads vehicles to existence-check vehicle_id); the codebase does not wrap that lookup behind an interface in 01_vehicle_catalog. This is intentional (one csproj, one DB) — see ADR-008.

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3. Testing Strategy (as observed)

Status (today): NO automated tests are present in this codebase. The Tech Stack table in _docs/02_document/architecture.md § 2 says "Tests: None present"; _docs/02_document/00_discovery.md § Repository Layout confirms there is no tests/ directory and the csproj has no test project sibling. The autodev existing-code flow's Phase A Steps 3 → 7 (Test Spec → Decompose Tests → Implement Tests → Run Tests) is the planned path to close this gap.

3.1 What exists today

Layer	Coverage	Where it is
Unit	None	—
Integration / functional	None	—
Non-functional (perf, load, security)	None	—
Health probe	One endpoint (GET /health returns { status: "healthy" })	Program.cs MapGet("/health")
Schema sanity	Indirect — DatabaseMigrator runs at every startup; if a column/table is missing the process crashes	Database/DatabaseMigrator.cs
Wire-shape verification	Manual diff against ../../suite/_docs/00_top_level_architecture.md § Error Response Format + § Pagination	Code review

3.2 What the autodev existing-code flow will produce

• Step 3 (Test Spec) → _docs/02_document/tests/traceability-matrix.md + per-flow scenario files for F1–F7. The 8 ADRs and 7 carry-forward concerns from architecture.md are the seed set for test scenarios.
• Step 4 (Code Testability Revision) → minimal, surgical fixes if the codebase blocks tests from running (env-driven DATABASE_URL already lands here; hardcoded dev fallbacks in Program.cs are the prime candidate). Scope: smallest set of changes; deeper refactors deferred to Step 8.
• Step 5 (Decompose Tests) → per-test task files in _docs/02_tasks/todo/, plus _test_infrastructure.md.
• Step 6 (Implement Tests) → tests/Azaion.Missions.Tests/ sibling project (xUnit is the suite-standard choice; per coderule.mdc "follow the established directory structure", no src/ layer).
• Step 7 (Run Tests) → green test suite forms the safety net for Step 8 (Refactor) and every Phase B feature cycle thereafter.

3.3 Scenarios likely to land first (anticipated, not yet specified)

These are obvious test seams given the F1–F7 flows and the 7 carry-forward concerns; the actual scenario set is produced by Step 3.

Priority	Scenario family	Why it lands first
1	MissionService.DeleteMission — full cascade in dependency order	Critical-flow F3, NOT transaction-wrapped today; tests would catch any future regressions in the cascade chain immediately
1	WaypointService.DeleteWaypoint — scoped cascade variant	Same reason as F3; same NO-transaction caveat
2	MissionService.CreateMission / UpdateMission — vehicle_id existence check + spec-vs-code 400 vs 404 divergence	Locks in the current behaviour so the spec-conformance fix is intentional, not accidental
2	VehicleService.SetDefault / Create / Update — "exactly one default" race	B12 decision (spec-vs-code stricter behaviour) — tests pin whichever resolution the user picks
2	ErrorHandlingMiddleware mapping (KeyNotFoundException → 404, ArgumentException → 400, InvalidOperationException → 409, fallthrough → 500)	Wire-shape contract used by every flow
3	JWT validation — accept valid HS256 / reject invalid signature / reject expired (with 1-min skew) / reject missing-FL claim	F5 cross-cutting; pins the local-validation contract
3	DatabaseMigrator.Migrate — idempotent on a fresh DB, idempotent on already-migrated DB, B9 DROP on a fielded-legacy DB	F6; tests guard the only explicit destructive step

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4. Non-functional behaviour (observed)

Concern	Observed behaviour	Where it is set	Notes
Latency	Single-digit ms typical; cascade delete = 4–7 sequential round-trips against local Postgres	Database/AppDataConnection.cs (per-request scope), MissionService.DeleteMission	No SLO in spec; observed under operator-paced load
Throughput	Operator-paced (~1 op/s peak); not load-tested	—	Edge deployment shape; not a hot path
Availability	Best-effort per device; Watchtower restarts on crash; flight-gate prevents restart mid-mission	Dockerfile + ../../suite/_infra/_compose/, suite arch doc	No multi-instance HA per device by design
Recovery	RTO ≈ container restart time (~10s); RPO = device-local backup cadence (suite concern)	Watchtower + suite-level backup	—
Cascade atomicity	Currently violated (ADR-006); one-line fix queued	Services/MissionService.cs, Services/WaypointService.cs	Recommended to land with B6
Wire-shape conformance	Currently divergent on entity/DTO case + error envelope's missing errors field (ADR-002)	Program.cs (no JsonNamingPolicy.CamelCase); Middleware/ErrorHandlingMiddleware.cs (anonymous object envelope)	Cutover is suite-wide; out of this Epic
Health endpoint	< 10 ms typical (no DB ping); used by Watchtower + reverse proxy	Program.cs MapGet("/health")	Future improvement: gate on DB ping
Resource limits	None in code; container-level limits set by edge compose	Dockerfile (no --memory / cpu limits inside)	Suite-level concern

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5. References

5.1 Source artefacts (this repo)

Concern	File
Web host composition	Program.cs
Vehicle catalog	Controllers/AircraftsController.cs (post-B6/B8: Controllers/VehiclesController.cs), Services/AircraftService.cs (post-B6: VehicleService.cs)
Mission planning	Controllers/FlightsController.cs (post-B6/B8: Controllers/MissionsController.cs), Services/FlightService.cs (post-B6: MissionService.cs), Services/WaypointService.cs
Persistence	Database/AppDataConnection.cs, Database/DatabaseMigrator.cs, Database/Entities/*.cs
Identity	Auth/JwtExtensions.cs
HTTP conventions	Middleware/ErrorHandlingMiddleware.cs, DTOs/PaginatedResponse.cs, DTOs/ErrorResponse.cs
Container	Dockerfile
CI	.woodpecker/build-arm.yml
Project	Azaion.Flights.csproj (post-B5: Azaion.Missions.csproj)

5.2 Generated documentation (this repo)

Doc	Path
Discovery	_docs/02_document/00_discovery.md
Per-module docs (12 modules)	_docs/02_document/modules/*.md
Per-component descriptions (6 components)	_docs/02_document/components/*/description.md
Module layout (file ownership + layering)	_docs/02_document/module-layout.md
Architecture (this solution's source-of-truth)	_docs/02_document/architecture.md
System flows (F1–F7)	_docs/02_document/system-flows.md + _docs/02_document/diagrams/flows/*.md
Data model	_docs/02_document/data_model.md
Glossary (confirmed by user)	_docs/02_document/glossary.md
Verification log (drift mapping)	_docs/02_document/04_verification_log.md
Deployment notes	_docs/02_document/deployment/{containerization,ci_cd_pipeline,environment_strategy,observability}.md

5.3 Suite-level cross-references

Concern	File
Primary spec for this service	../../suite/_docs/02_missions.md
Top-level architecture (error envelope, pagination, topology)	../../suite/_docs/00_top_level_architecture.md
Authoritative ER diagram (shared edge Postgres)	../../suite/_docs/00_database_schema.md
Roles & permissions (FL permission origin)	../../suite/_docs/00_roles_permissions.md
GPS-Denied (separate service after B7)	../../suite/_docs/11_gps_denied.md
CMMC L2 scorecard (JWT iss/aud finding)	../../suite/_docs/05_security/cmmc_l2_scorecard.md
Repo-config (post-rename)	../../suite/_docs/_repo-config.yaml

5.4 Tracker (Jira AZ project)

Plan ID	Jira	Type	SP	Status
Epic	AZ-539	Epic	—	To Do
B1 (local docs)	AZ-540	Task	3	Done
B2 (suite docs)	AZ-541	Task	3	Done
B3 (state bookkeeping)	AZ-542	Task	3	Done
B4 (repo rename)	AZ-543	Task	3	To Do
B5 (csproj + namespace)	AZ-544	Story	3	To Do
B6 (domain rename)	AZ-545	Story	5	To Do
B7 (drop GPS-Denied)	AZ-546	Story	3	To Do
B8 (HTTP routes)	AZ-547	Story	3	To Do
B9 (DB migration)	AZ-548	Story	5	To Do
B10 (Dockerfile + image tag)	AZ-549	Task	2	To Do
B11 (consumer cutover)	AZ-550	Story	5	To Do
B12 (default vehicle rule decision)	AZ-551	Task	2	To Do

Leftover index: _docs/_process_leftovers/2026-05-14_rename-flights-to-missions.md.