Skip sync for existing data and too-recent dates

- Check consumption table before fetching; return early if data exists
- Return "no data to fetch" for dates >= yesterday (not yet available)
- Add sync-month.sh script to sync all days in a month
- Add kill-server.sh script to free port 3000

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

sync-month.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Sync Eloverblik data for a specific month.
+# Usage: ./sync-month.sh 2026-02
+set -euo pipefail
+
+if [ $# -ne 1 ]; then
+  echo "Usage: $0 YYYY-MM"
+  exit 1
+fi
+
+MONTH="$1"
+BASE_URL="${BASE_URL:-http://localhost:3000}"
+
+# Last day of the month (macOS date)
+days=$(date -j -v+1m -v-1d -f "%Y-%m-%d" "${MONTH}-01" "+%d")
+
+echo "Syncing $MONTH ($days days)"
+
+for day in $(seq 1 "$days"); do
+  d=$(printf "%s-%02d" "$MONTH" "$day")
+  resp=$(curl -s -X POST "${BASE_URL}/eloverblik/sync?date=${d}")
+  text=$(echo "$resp" | sed 's/<[^>]*>//g' | xargs)
+
+  if [ -z "$text" ]; then
+    echo "$d: no response (server down?)"
+    exit 1
+  fi
+
+  echo "$d: $text"
+done
+
+echo "Done."