Fix capture: endpoint ID/URL mismatch, routing, and extractID

- Use URL as endpoint ID so handler path-segment lookups resolve correctly.
  Previously CreateEndpoint generated a random UUID for the ID, but the
  handler always queries by the path segment — every GetEndpoint call
  missed, causing duplicate UNIQUE violations on subsequent requests
  and orphaned request records (endpoint_id mismatch).

- Register both /{endpoint} and /{endpoint}/ patterns so bare and
  nested capture paths both route to the handler (Go 1.22+ ServeMux).

- Strip query string in extractID for robustness, even though the
  library never sends ? in r.URL.Path.

- Remove unused net/http import from handler_test.go (caught by vet).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

internal/handler/handler.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"io"
-	"log"
 	"net/http"
 	"strings"
 
@@ -15,7 +14,10 @@ type Handler struct{ Repo store.Repository }
 
 func New(repo store.Repository) *Handler { return &Handler{Repo: repo} }
 
-func (h *Handler) RegisterRoutes(mux *http.ServeMux) { mux.Handle("/{endpoint}", h) }
+func (h *Handler) RegisterRoutes(mux *http.ServeMux) {
+	mux.Handle("/{endpoint}", h)
+	mux.Handle("/{endpoint}/", h)
+}
 
 func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	eid := extractID(r.URL.Path)
@@ -39,6 +41,7 @@ func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 func extractID(p string) string {
 	t := strings.TrimLeft(p, "/")
-	if i := strings.Index(t, "/"); i >= 0 { return t[:i] }
+	if i := strings.IndexByte(t, '?'); i >= 0 { t = t[:i] }
+	if i := strings.IndexByte(t, '/'); i >= 0 { return t[:i] }
 	return t
 }

internal/handler/handler_test.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"io"
-	"net/http"
 	"net/http/httptest"
 	"strings"
 	"testing"

internal/store/sqlite_repo.go

@@ -16,9 +16,8 @@ func NewSQLiteRepo(db *sql.DB) (Repository, error) {
 }
 
 func (r *sqliteRepo) CreateEndpoint(ctx context.Context, url string) (*Endpoint, error) {
-	id := uuid.NewString()
 	now := utcNow()
-	e := &Endpoint{ID: id, URL: url, CreatedAt: now, UpdatedAt: now}
+	e := &Endpoint{ID: url, URL: url, CreatedAt: now, UpdatedAt: now}
 	_, err := r.db.ExecContext(ctx, `INSERT INTO endpoints (id, url, created_at, updated_at) VALUES (?, ?, ?, ?)`, e.ID, e.URL, e.CreatedAt, e.UpdatedAt)
 	if err != nil { return nil, fmt.Errorf("store: create endpoint: %w", err) }
 	return e, nil