Scaffold full-stack volunteer scheduling application

Go backend with domain-based packages (volunteer, schedule, timeoff,
checkin, notification), SQLite storage, JWT auth, and chi router.
React TypeScript frontend with routing, auth context, and pages for
all core features. Multi-stage Dockerfile and docker-compose included.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/checkin/handler.go

@@ -0,0 +1,64 @@
+package checkin
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"git.unsupervised.ca/walkies/internal/respond"
+	"git.unsupervised.ca/walkies/internal/server/middleware"
+)
+
+type Handler struct {
+	store *Store
+}
+
+func NewHandler(store *Store) *Handler {
+	return &Handler{store: store}
+}
+
+// POST /api/v1/checkin
+func (h *Handler) CheckIn(w http.ResponseWriter, r *http.Request) {
+	claims := middleware.ClaimsFromContext(r.Context())
+	var in CheckInInput
+	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
+		respond.Error(w, http.StatusBadRequest, "invalid request body")
+		return
+	}
+	ci, err := h.store.CheckIn(claims.VolunteerID, in)
+	if err != nil {
+		respond.Error(w, http.StatusConflict, err.Error())
+		return
+	}
+	respond.JSON(w, http.StatusCreated, ci)
+}
+
+// POST /api/v1/checkout
+func (h *Handler) CheckOut(w http.ResponseWriter, r *http.Request) {
+	claims := middleware.ClaimsFromContext(r.Context())
+	var in CheckOutInput
+	json.NewDecoder(r.Body).Decode(&in)
+	ci, err := h.store.CheckOut(claims.VolunteerID, in)
+	if err != nil {
+		respond.Error(w, http.StatusConflict, err.Error())
+		return
+	}
+	respond.JSON(w, http.StatusOK, ci)
+}
+
+// GET /api/v1/checkin/history
+func (h *Handler) History(w http.ResponseWriter, r *http.Request) {
+	claims := middleware.ClaimsFromContext(r.Context())
+	volunteerID := int64(0)
+	if claims.Role != "admin" {
+		volunteerID = claims.VolunteerID
+	}
+	history, err := h.store.History(volunteerID)
+	if err != nil {
+		respond.Error(w, http.StatusInternalServerError, "could not get history")
+		return
+	}
+	if history == nil {
+		history = []CheckIn{}
+	}
+	respond.JSON(w, http.StatusOK, history)
+}