feat: rebuild work queue api with fastapi and postgres

app/routers/__init__.py

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+# routers package

app/routers/projects.py

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+from uuid import uuid4
+
+from fastapi import APIRouter, HTTPException
+
+from app.db import fetch_project_or_404, get_conn, utcnow
+from app.models import Project, ProjectCreate, ProjectUpdate
+
+router = APIRouter(prefix="/projects", tags=["projects"])
+
+
+@router.post("", response_model=Project, status_code=201)
+def create_project(payload: ProjectCreate) -> Project:
+    if not payload.name.strip():
+        raise HTTPException(status_code=400, detail="name is required")
+    now = utcnow()
+    record = {
+        "id": str(uuid4()),
+        "name": payload.name.strip(),
+        "external_ref": payload.external_ref,
+        "created_at": now,
+        "updated_at": now,
+    }
+    with get_conn() as conn:
+        conn.execute(
+            "INSERT INTO projects (id, name, external_ref, created_at, updated_at) VALUES (%s, %s, %s, %s, %s)",
+            (record["id"], record["name"], record["external_ref"], record["created_at"], record["updated_at"]),
+        )
+        conn.commit()
+    return Project.model_validate(record)
+
+
+@router.get("", response_model=list[Project])
+def list_projects() -> list[Project]:
+    with get_conn() as conn:
+        rows = conn.execute(
+            "SELECT id, name, external_ref, created_at, updated_at FROM projects ORDER BY created_at ASC"
+        ).fetchall()
+    return [Project.model_validate(row) for row in rows]
+
+
+@router.get("/{project_id}", response_model=Project)
+def get_project(project_id: str) -> Project:
+    with get_conn() as conn:
+        return Project.model_validate(fetch_project_or_404(conn, project_id))
+
+
+@router.patch("/{project_id}", response_model=Project)
+def update_project(project_id: str, payload: ProjectUpdate) -> Project:
+    with get_conn() as conn:
+        current = fetch_project_or_404(conn, project_id)
+        if payload.name is not None:
+            if not payload.name.strip():
+                raise HTTPException(status_code=400, detail="name cannot be empty")
+            current["name"] = payload.name.strip()
+        if payload.external_ref is not None:
+            current["external_ref"] = payload.external_ref
+        current["updated_at"] = utcnow()
+        conn.execute(
+            "UPDATE projects SET name = %s, external_ref = %s, updated_at = %s WHERE id = %s",
+            (current["name"], current["external_ref"], current["updated_at"], project_id),
+        )
+        conn.commit()
+        return Project.model_validate(current)

app/routers/work.py

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+from __future__ import annotations
+
+import json
+from uuid import uuid4
+
+from fastapi import APIRouter, HTTPException, Response
+from psycopg.errors import UniqueViolation
+
+from app.db import (
+    TERMINAL_STATUSES,
+    complete_dispatch_log,
+    create_dispatch_log,
+    fetch_dispatch_log,
+    fetch_project_or_404,
+    fetch_work_or_404,
+    get_conn,
+    utcnow,
+    validate_transition,
+)
+from app.models import DispatchLog, WorkCreate, WorkItem, WorkUpdate
+
+router = APIRouter(prefix="/work", tags=["work"])
+
+
+@router.post("", response_model=WorkItem, status_code=201)
+def create_work(payload: WorkCreate) -> WorkItem:
+    if not payload.type.strip() or not payload.description.strip():
+        raise HTTPException(status_code=400, detail="type and description are required")
+    now = utcnow()
+    record = {
+        "id": str(uuid4()),
+        "project_id": str(payload.project_id) if payload.project_id else None,
+        "type": payload.type.strip(),
+        "description": payload.description.strip(),
+        "payload": payload.payload,
+        "priority": payload.priority,
+        "status": "queued",
+        "assigned_agent": payload.assigned_agent,
+        "created_by": payload.created_by,
+        "created_at": now,
+        "updated_at": now,
+        "completed_at": None,
+        "outcome": None,
+        "notes": None,
+        "dispatch_log": [],
+    }
+    with get_conn() as conn:
+        if record["project_id"]:
+            fetch_project_or_404(conn, record["project_id"])
+        conn.execute(
+            """
+            INSERT INTO work_items (
+                id, project_id, type, description, payload, priority, status,
+                assigned_agent, created_by, created_at, updated_at, completed_at, outcome, notes
+            ) VALUES (%s, %s, %s, %s, %s::jsonb, %s, %s, %s, %s, %s, %s, %s, %s, %s)
+            """,
+            (
+                record["id"],
+                record["project_id"],
+                record["type"],
+                record["description"],
+                json.dumps(record["payload"]) if record["payload"] is not None else None,
+                record["priority"],
+                record["status"],
+                record["assigned_agent"],
+                record["created_by"],
+                record["created_at"],
+                record["updated_at"],
+                None,
+                None,
+                None,
+            ),
+        )
+        conn.commit()
+    return WorkItem.model_validate(record)
+
+
+@router.get("", response_model=list[WorkItem])
+def list_work(status: str | None = None, agent: str | None = None, project_id: str | None = None, since: str | None = None) -> list[WorkItem]:
+    clauses: list[str] = []
+    params: list[object] = []
+    if status:
+        clauses.append("status = %s")
+        params.append(status)
+    if agent:
+        clauses.append("assigned_agent = %s")
+        params.append(agent)
+    if project_id:
+        clauses.append("project_id = %s")
+        params.append(project_id)
+    if since:
+        clauses.append("created_at > %s::timestamptz")
+        params.append(since)
+    query = """
+        SELECT id, project_id, type, description, payload, priority, status, assigned_agent,
+               created_by, created_at, updated_at, completed_at, outcome, notes
+        FROM work_items
+    """
+    if clauses:
+        query += " WHERE " + " AND ".join(clauses)
+    query += " ORDER BY created_at ASC" if since else " ORDER BY priority ASC, created_at ASC"
+    with get_conn() as conn:
+        rows = conn.execute(query, tuple(params)).fetchall()
+    return [WorkItem.model_validate({**row, "dispatch_log": []}) for row in rows]
+
+
+@router.get("/{work_id}", response_model=WorkItem)
+def get_work(work_id: str) -> WorkItem:
+    with get_conn() as conn:
+        row = fetch_work_or_404(conn, work_id)
+        row["dispatch_log"] = fetch_dispatch_log(conn, work_id)
+    return WorkItem.model_validate(row)
+
+
+@router.patch("/{work_id}", response_model=WorkItem)
+def update_work(work_id: str, payload: WorkUpdate) -> WorkItem:
+    with get_conn() as conn:
+        current = fetch_work_or_404(conn, work_id)
+        if payload.assigned_agent is not None:
+            current["assigned_agent"] = payload.assigned_agent
+        if payload.notes is not None:
+            current["notes"] = payload.notes
+        requested_status = payload.status
+        if requested_status is not None:
+            validate_transition(current["status"], requested_status, current.get("assigned_agent"), payload.outcome, payload.notes)
+            current["status"] = requested_status
+            if requested_status in TERMINAL_STATUSES:
+                current["completed_at"] = utcnow()
+                current["outcome"] = payload.outcome
+            else:
+                current["completed_at"] = None
+                current["outcome"] = None
+        current["updated_at"] = utcnow()
+        try:
+            conn.execute(
+                """
+                UPDATE work_items
+                SET project_id = %s, type = %s, description = %s, payload = %s::jsonb, priority = %s,
+                    status = %s, assigned_agent = %s, created_by = %s, created_at = %s, updated_at = %s,
+                    completed_at = %s, outcome = %s, notes = %s
+                WHERE id = %s
+                """,
+                (
+                    current["project_id"],
+                    current["type"],
+                    current["description"],
+                    json.dumps(current["payload"]) if current["payload"] is not None else None,
+                    current["priority"],
+                    current["status"],
+                    current["assigned_agent"],
+                    current["created_by"],
+                    current["created_at"],
+                    current["updated_at"],
+                    current["completed_at"],
+                    current["outcome"],
+                    current["notes"],
+                    work_id,
+                ),
+            )
+            if requested_status == "dispatched":
+                create_dispatch_log(conn, work_id, current["assigned_agent"], current["updated_at"])
+            if requested_status in TERMINAL_STATUSES:
+                complete_dispatch_log(conn, work_id, current["completed_at"], current["outcome"])
+            conn.commit()
+        except UniqueViolation:
+            conn.rollback()
+            raise HTTPException(status_code=409, detail="agent already has an in_progress work item") from None
+        current["dispatch_log"] = fetch_dispatch_log(conn, work_id)
+    return WorkItem.model_validate(current)
+
+
+@router.delete("/{work_id}", status_code=204)
+def delete_work(work_id: str) -> Response:
+    with get_conn() as conn:
+        current = fetch_work_or_404(conn, work_id)
+        if current["status"] not in {"queued", "dispatched"}:
+            raise HTTPException(status_code=400, detail="only queued or dispatched items can be cancelled")
+        current["status"] = "cancelled"
+        current["updated_at"] = utcnow()
+        current["completed_at"] = utcnow()
+        current["outcome"] = "cancelled"
+        conn.execute(
+            "UPDATE work_items SET status = %s, updated_at = %s, completed_at = %s, outcome = %s WHERE id = %s",
+            (current["status"], current["updated_at"], current["completed_at"], current["outcome"], work_id),
+        )
+        complete_dispatch_log(conn, work_id, current["completed_at"], current["outcome"])
+        conn.commit()
+    return Response(status_code=204)