diff --git a/dags/edoxid_calendar_sync.py b/dags/edoxid_calendar_sync.py
new file mode 100644
index 0000000..f88c56b
--- /dev/null
+++ b/dags/edoxid_calendar_sync.py
@@ -0,0 +1,55 @@
+"""
+DAG: sync jadwal sidang eDOXID -> Google Calendar "Jadwal Sidang" + reminder email.
+
+Baca DB doxid2022 (read-only, user calendar_sync_ro) tiap 5 menit, lalu:
+  1. create/update/delete event Google Calendar sesuai jadwal sidang yang
+     baru/berubah/dibatalkan.
+  2. Kirim email reminder terpisah (subjek "[PENGINGAT SEBELUM H-1]" dan
+     "[PENGINGAT 1 JAM SEBELUM]") ke semua attendee (mahasiswa+pembimbing+penguji)
+     pas jam H-1 07:00 dan 1 jam sebelum sidang — karena reminders.overrides
+     bawaan Calendar API cuma berlaku untuk kalender pemilik event (TU), TIDAK
+     ikut ke kalender pribadi tiap attendee (keterbatasan Google Calendar,
+     dikonfirmasi 2026-07-27).
+
+Auth Google pakai OAuth refresh token sebagai tu@informatika.untan.ac.id
+langsung (bukan service account — service account tidak bisa invite attendee
+tanpa Domain-Wide Delegation, sudah dicoba dan ditolak Google 2026-07-27).
+Refresh token perlu scope gabungan: calendar + gmail.send.
+
+Tidak menyentuh kode/DB aplikasi eDOXID (`/var/www/manajemen-usulan`) sama
+sekali selain query SELECT read-only ke 3 tabel: submissions, verificators, users.
+
+Environment yang wajib di-set di Coolify (service airflow-scheduler):
+    EDOXID_DB_PASSWORD
+    EDOXID_GOOGLE_CLIENT_ID, EDOXID_GOOGLE_CLIENT_SECRET, EDOXID_GOOGLE_REFRESH_TOKEN
+    (refresh token WAJIB scope "calendar" + "gmail.send" sekaligus, bukan cuma calendar)
+Opsional (lihat scripts/edoxid_calendar_config.py untuk default):
+    EDOXID_DB_HOST, EDOXID_DB_PORT, EDOXID_DB_DATABASE, EDOXID_DB_USERNAME,
+    EDOXID_GOOGLE_CALENDAR_ID, EDOXID_STATE_SQLITE_PATH, EDOXID_SYNC_MIN_DATE
+"""
+
+from datetime import datetime, timedelta
+
+from airflow import DAG
+from airflow.operators.python import PythonOperator
+
+from scripts.edoxid_calendar_sync import run_sync
+
+with DAG(
+    dag_id="edoxid_calendar_sync",
+    description="Sync jadwal sidang eDOXID ke Google Calendar 'Jadwal Sidang'",
+    start_date=datetime(2026, 7, 27),
+    schedule_interval="*/5 * * * *",
+    catchup=False,
+    max_active_runs=1,
+    default_args={
+        "owner": "informatika",
+        "retries": 1,
+        "retry_delay": timedelta(minutes=1),
+    },
+    tags=["edoxid", "calendar", "sidang"],
+) as dag:
+    sync_task = PythonOperator(
+        task_id="sync_jadwal_sidang",
+        python_callable=run_sync,
+    )
diff --git a/docker-compose.yaml b/docker-compose.yaml
index d1e3105..71bdd61 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -43,6 +43,15 @@ services:
       - DB_NAME=${DB_NAME:-informatika}
       - SERPAPI_KEY=${SERPAPI_KEY}
       - SERPAPI_MAX_REQUESTS=${SERPAPI_MAX_REQUESTS:-90}
+      # sync jadwal sidang eDOXID -> Google Calendar (nilai di-set di Coolify UI)
+      - EDOXID_DB_HOST=${EDOXID_DB_HOST:-203.24.50.52}
+      - EDOXID_DB_PORT=${EDOXID_DB_PORT:-3306}
+      - EDOXID_DB_DATABASE=${EDOXID_DB_DATABASE:-doxid2022}
+      - EDOXID_DB_USERNAME=${EDOXID_DB_USERNAME:-calendar_sync_ro}
+      - EDOXID_DB_PASSWORD=${EDOXID_DB_PASSWORD}
+      - EDOXID_GOOGLE_CLIENT_ID=${EDOXID_GOOGLE_CLIENT_ID}
+      - EDOXID_GOOGLE_CLIENT_SECRET=${EDOXID_GOOGLE_CLIENT_SECRET}
+      - EDOXID_GOOGLE_REFRESH_TOKEN=${EDOXID_GOOGLE_REFRESH_TOKEN}
     extra_hosts:
       - "host.docker.internal:host-gateway"
     volumes:
diff --git a/requirements.txt b/requirements.txt
index 2c30da0..f7a4813 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,6 +5,7 @@ pandas-gbq
 apache-airflow-providers-google
 google-cloud-bigquery
 google-auth
+google-api-python-client
 pandas
 numpy
 wbgapi
diff --git a/scripts/edoxid_calendar_config.py b/scripts/edoxid_calendar_config.py
new file mode 100644
index 0000000..3577fe3
--- /dev/null
+++ b/scripts/edoxid_calendar_config.py
@@ -0,0 +1,56 @@
+import os
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class DbConfig:
+    host: str
+    port: int
+    database: str
+    username: str
+    password: str
+
+
+@dataclass(frozen=True)
+class GoogleConfig:
+    client_id: str
+    client_secret: str
+    refresh_token: str
+    calendar_id: str
+
+
+def get_db_config() -> DbConfig:
+    return DbConfig(
+        host=os.environ.get("EDOXID_DB_HOST", "203.24.50.52"),
+        port=int(os.environ.get("EDOXID_DB_PORT", "3306")),
+        database=os.environ.get("EDOXID_DB_DATABASE", "doxid2022"),
+        username=os.environ.get("EDOXID_DB_USERNAME", "calendar_sync_ro"),
+        password=os.environ["EDOXID_DB_PASSWORD"],
+    )
+
+
+def get_google_config() -> GoogleConfig:
+    return GoogleConfig(
+        client_id=os.environ["EDOXID_GOOGLE_CLIENT_ID"],
+        client_secret=os.environ["EDOXID_GOOGLE_CLIENT_SECRET"],
+        refresh_token=os.environ["EDOXID_GOOGLE_REFRESH_TOKEN"],
+        # Calendar "Jadwal Sidang" milik tu@informatika.untan.ac.id
+        calendar_id=os.environ.get(
+            "EDOXID_GOOGLE_CALENDAR_ID",
+            "c_1a4ilomn51i1r0mccnjqe9cumg@group.calendar.google.com",
+        ),
+    )
+
+
+def get_state_sqlite_path() -> str:
+    return os.environ.get("EDOXID_STATE_SQLITE_PATH", "/opt/airflow/scripts/edoxid_calendar_state.sqlite")
+
+
+def get_sync_min_date() -> str:
+    """Batas bawah tanggal sidang yang disinkron, format 'YYYY-MM-DD'.
+
+    Default: hari ini — supaya run pertama TIDAK langsung mengirim invite
+    Calendar ke semua submission lama (2019-2026, ~1156 baris per cek 2026-07-27)
+    yang sudah punya schedule. Ubah lewat env var kalau memang mau backfill sengaja.
+    """
+    return os.environ.get("EDOXID_SYNC_MIN_DATE", "today")
diff --git a/scripts/edoxid_calendar_database.py b/scripts/edoxid_calendar_database.py
new file mode 100644
index 0000000..14c0818
--- /dev/null
+++ b/scripts/edoxid_calendar_database.py
@@ -0,0 +1,93 @@
+from datetime import date, datetime
+
+import pymysql
+import pymysql.cursors
+
+from scripts.edoxid_calendar_config import DbConfig
+
+
+class Database:
+    """Koneksi READ-ONLY ke doxid2022 (DB aplikasi eDOXID) pakai user
+    `calendar_sync_ro` yang cuma punya grant SELECT ke submissions/verificators/users.
+    Tidak pernah menulis apa pun ke DB ini."""
+
+    def __init__(self, config: DbConfig):
+        self._conn = pymysql.connect(
+            host=config.host,
+            port=config.port,
+            user=config.username,
+            password=config.password,
+            database=config.database,
+            cursorclass=pymysql.cursors.DictCursor,
+            autocommit=True,
+        )
+
+    def close(self) -> None:
+        self._conn.close()
+
+    def get_scheduled_submissions(self, min_date: str = "today") -> list[dict]:
+        """Submission yang sudah punya jadwal sidang (schedule IS NOT NULL),
+        dibatasi >= min_date supaya tidak menyapu semua histori lama.
+        min_date: 'today' atau string 'YYYY-MM-DD'.
+        """
+        cutoff = date.today() if min_date == "today" else datetime.strptime(min_date, "%Y-%m-%d").date()
+
+        with self._conn.cursor() as cur:
+            cur.execute(
+                """
+                SELECT s.id, s.schedule, s.room, s.title, s.type_id,
+                       u.name AS student_name, u.email AS student_email, u.unique_id AS student_nim
+                FROM submissions s
+                JOIN users u ON u.id = s.student_id
+                WHERE s.schedule IS NOT NULL
+                  AND s.schedule >= %s
+                """,
+                (cutoff,),
+            )
+            submissions = cur.fetchall()
+
+        if not submissions:
+            return []
+
+        ids = [s["id"] for s in submissions]
+        placeholders = ",".join(["%s"] * len(ids))
+
+        # Diurutkan v.id supaya "Pembimbing 1/2" & "Penguji 1/2" konsisten
+        # dengan urutan input aslinya.
+        with self._conn.cursor() as cur:
+            cur.execute(
+                f"""
+                SELECT v.submission_id, v.type, u.name, u.email
+                FROM verificators v
+                JOIN users u ON u.id = v.user_id
+                WHERE v.submission_id IN ({placeholders})
+                  AND v.type IN ('Pembimbing', 'Penguji')
+                  AND u.email IS NOT NULL AND u.email != ''
+                ORDER BY v.id
+                """,
+                ids,
+            )
+            verificator_rows = cur.fetchall()
+
+        verificators_by_submission: dict[int, list[dict]] = {}
+        for row in verificator_rows:
+            verificators_by_submission.setdefault(row["submission_id"], []).append(
+                {"type": row["type"], "name": row["name"], "email": row["email"]}
+            )
+
+        for submission in submissions:
+            submission["verificators"] = verificators_by_submission.get(submission["id"], [])
+
+        return submissions
+
+    def get_ids_with_active_schedule(self) -> set[int]:
+        """ID semua submission yang MASIH punya schedule (tanpa filter tanggal).
+
+        Dipakai KHUSUS untuk deteksi orphan/cancelled — supaya sidang yang
+        tanggalnya sudah lewat (tapi memang belum dibatalkan) tidak salah
+        dianggap "cancelled" dan event Calendar-nya ikut terhapus, gara-gara
+        filter min_date di get_scheduled_submissions() menyisihkannya.
+        """
+        with self._conn.cursor() as cur:
+            cur.execute("SELECT id FROM submissions WHERE schedule IS NOT NULL")
+            return {row["id"] for row in cur.fetchall()}
diff --git a/scripts/edoxid_calendar_gmail.py b/scripts/edoxid_calendar_gmail.py
new file mode 100644
index 0000000..669939d
--- /dev/null
+++ b/scripts/edoxid_calendar_gmail.py
@@ -0,0 +1,35 @@
+import base64
+from email.mime.text import MIMEText
+
+from google.auth.transport.requests import Request
+from google.oauth2.credentials import Credentials
+from googleapiclient.discovery import build
+
+from scripts.edoxid_calendar_config import GoogleConfig
+
+
+class GmailService:
+    """Kirim email reminder H-1/1-jam sebagai tu@informatika.untan.ac.id
+    langsung (scope gmail.send, akun OAuth yang sama dengan Calendar)."""
+
+    def __init__(self, config: GoogleConfig):
+        creds = Credentials(
+            token=None,
+            refresh_token=config.refresh_token,
+            token_uri="https://oauth2.googleapis.com/token",
+            client_id=config.client_id,
+            client_secret=config.client_secret,
+            scopes=["https://www.googleapis.com/auth/gmail.send"],
+        )
+        creds.refresh(Request())
+
+        self._service = build("gmail", "v1", credentials=creds, cache_discovery=False)
+
+    def send(self, to: list[str], subject: str, body_text: str) -> str:
+        message = MIMEText(body_text, "plain", "utf-8")
+        message["to"] = ", ".join(to)
+        message["subject"] = subject
+
+        raw = base64.urlsafe_b64encode(message.as_bytes()).decode("utf-8")
+        result = self._service.users().messages().send(userId="me", body={"raw": raw}).execute()
+        return result["id"]
diff --git a/scripts/edoxid_calendar_google.py b/scripts/edoxid_calendar_google.py
new file mode 100644
index 0000000..9818353
--- /dev/null
+++ b/scripts/edoxid_calendar_google.py
@@ -0,0 +1,184 @@
+from datetime import datetime, timedelta
+from zoneinfo import ZoneInfo
+
+from google.auth.transport.requests import Request
+from google.oauth2.credentials import Credentials
+from googleapiclient.discovery import build
+from googleapiclient.errors import HttpError
+
+from scripts.edoxid_calendar_config import GoogleConfig
+
+JAKARTA_TZ = ZoneInfo("Asia/Jakarta")
+
+TYPE_LABELS = {
+    1: "Seminar Proposal",
+    2: "Seminar Hasil",
+    3: "Sidang Akhir",
+}
+
+DAY_NAMES = {
+    "Monday": "Senin", "Tuesday": "Selasa", "Wednesday": "Rabu", "Thursday": "Kamis",
+    "Friday": "Jumat", "Saturday": "Sabtu", "Sunday": "Minggu",
+}
+
+MONTH_NAMES = {
+    "January": "Januari", "February": "Februari", "March": "Maret", "April": "April",
+    "May": "Mei", "June": "Juni", "July": "Juli", "August": "Agustus",
+    "September": "September", "October": "Oktober", "November": "November", "December": "Desember",
+}
+
+
+# --- Fungsi format, dipakai bareng oleh event Calendar & email reminder (edoxid_calendar_gmail_reminder.py) ---
+
+def get_schedule_datetime(submission: dict) -> datetime:
+    schedule = submission["schedule"]
+    if isinstance(schedule, str):
+        schedule = datetime.fromisoformat(schedule)
+    return schedule.replace(tzinfo=JAKARTA_TZ)
+
+
+def get_type_label(submission: dict) -> str:
+    return TYPE_LABELS.get(submission["type_id"], "Sidang")
+
+
+def format_indonesian_date(date: datetime) -> str:
+    day = DAY_NAMES.get(date.strftime("%A"), date.strftime("%A"))
+    month = MONTH_NAMES.get(date.strftime("%B"), date.strftime("%B"))
+    return f"{day}, {date.strftime('%d')} {month} {date.strftime('%Y')}"
+
+
+def build_description(submission: dict) -> str:
+    schedule = get_schedule_datetime(submission)
+    type_label = get_type_label(submission)
+    pembimbing = [v for v in submission["verificators"] if v["type"] == "Pembimbing"]
+    penguji = [v for v in submission["verificators"] if v["type"] == "Penguji"]
+
+    lines = [
+        f"UNDANGAN {type_label.upper()} SECARA LURING",
+        "JURUSAN INFORMATIKA",
+        "",
+        "Mengundang Bapak dan Ibu dosen tim pembimbing dan penguji untuk hadir pada "
+        f"{type_label.lower()} mahasiswa yang dilaksanakan secara Luring.",
+        "",
+        f"👨‍🎓 {submission['student_name']} - {submission['student_nim']}",
+        "",
+        f"📖 {submission['title']}",
+        "",
+        f"📅 {format_indonesian_date(schedule)}",
+        f"🕑 {schedule.strftime('%H:%M')} WIB",
+        "",
+    ]
+
+    for i, v in enumerate(pembimbing, start=1):
+        lines.append(f"📕 Pembimbing {i} : {v['name']}")
+    for i, v in enumerate(penguji, start=1):
+        lines.append(f"📒 Penguji {i} : {v['name']}")
+
+    lines += [
+        "",
+        "Tempat:",
+        submission.get("room") or "-",
+        "",
+        "Terimakasih.",
+        "ttd",
+        "Kajur Informatika",
+    ]
+
+    return "\n".join(lines)
+
+
+def format_submission_summary(submission: dict) -> str:
+    """Ringkasan 1-baris untuk log Airflow — supaya kelihatan jelas di task log
+    siapa yang dapat undangan/reminder tanpa perlu buka Calendar/email manual."""
+    schedule = get_schedule_datetime(submission)
+    pembimbing = [v["name"] for v in submission["verificators"] if v["type"] == "Pembimbing"]
+    penguji = [v["name"] for v in submission["verificators"] if v["type"] == "Penguji"]
+
+    return (
+        f"{submission['student_name']} ({submission['student_nim']}) — "
+        f"{get_type_label(submission)} — \"{submission['title']}\" — "
+        f"{format_indonesian_date(schedule)} {schedule.strftime('%H:%M')} WIB "
+        f"@ {submission.get('room') or '-'} | "
+        f"Pembimbing: {', '.join(pembimbing) or '-'} | "
+        f"Penguji: {', '.join(penguji) or '-'}"
+    )
+
+
+def build_attendee_emails(submission: dict) -> list[str]:
+    emails = [submission["student_email"]] + [v["email"] for v in submission["verificators"]]
+    seen = set()
+    deduped = []
+    for email in emails:
+        if email and email not in seen:
+            seen.add(email)
+            deduped.append(email)
+    return deduped
+
+
+class GoogleCalendarService:
+    """Auth via OAuth refresh token sebagai tu@informatika.untan.ac.id LANGSUNG
+    (bukan service account) — service account tidak bisa invite attendee tanpa
+    Domain-Wide Delegation of Authority (dicoba & ditolak Google 2026-07-27)."""
+
+    def __init__(self, config: GoogleConfig):
+        self._calendar_id = config.calendar_id
+
+        creds = Credentials(
+            token=None,
+            refresh_token=config.refresh_token,
+            token_uri="https://oauth2.googleapis.com/token",
+            client_id=config.client_id,
+            client_secret=config.client_secret,
+            scopes=["https://www.googleapis.com/auth/calendar"],
+        )
+        creds.refresh(Request())
+
+        self._service = build("calendar", "v3", credentials=creds, cache_discovery=False)
+
+    def create_event(self, submission: dict) -> str:
+        event = self._build_event(submission)
+        result = (
+            self._service.events()
+            .insert(calendarId=self._calendar_id, body=event, sendUpdates="all")
+            .execute()
+        )
+        return result["id"]
+
+    def update_event(self, event_id: str, submission: dict) -> None:
+        event = self._build_event(submission)
+        self._service.events().update(
+            calendarId=self._calendar_id, eventId=event_id, body=event, sendUpdates="all"
+        ).execute()
+
+    def delete_event(self, event_id: str) -> None:
+        try:
+            self._service.events().delete(
+                calendarId=self._calendar_id, eventId=event_id, sendUpdates="all"
+            ).execute()
+        except HttpError as e:
+            # 404/410 berarti event sudah tidak ada (mis. dihapus manual) — aman diabaikan
+            if e.resp.status not in (404, 410):
+                raise
+
+    def _build_event(self, submission: dict) -> dict:
+        schedule = get_schedule_datetime(submission)
+        end = schedule + timedelta(hours=1)
+
+        return {
+            "summary": f"{get_type_label(submission)} — {submission['student_name']}",
+            "description": build_description(submission),
+            "location": submission.get("room") or "",
+            "start": {"dateTime": schedule.isoformat(), "timeZone": "Asia/Jakarta"},
+            "end": {"dateTime": end.isoformat(), "timeZone": "Asia/Jakarta"},
+            "attendees": [{"email": email} for email in build_attendee_emails(submission)],
+            "reminders": {"useDefault": False, "overrides": self._build_reminders(schedule)},
+        }
+
+    @staticmethod
+    def _build_reminders(schedule: datetime) -> list[dict]:
+        h1 = schedule.replace(hour=7, minute=0, second=0, microsecond=0) - timedelta(days=1)
+        minutes_h1 = max(0, int((schedule - h1).total_seconds() // 60))
+        return [
+            {"method": "popup", "minutes": minutes_h1},
+            {"method": "popup", "minutes": 60},
+        ]
diff --git a/scripts/edoxid_calendar_state_store.py b/scripts/edoxid_calendar_state_store.py
new file mode 100644
index 0000000..defe633
--- /dev/null
+++ b/scripts/edoxid_calendar_state_store.py
@@ -0,0 +1,98 @@
+import hashlib
+import json
+import sqlite3
+from datetime import datetime
+
+
+class StateStore:
+    """State lokal (SQLite) tracking submission_id -> event_id + content_hash.
+    Sengaja TIDAK di doxid2022 — kalau file ini hilang/reset, paling buruk
+    event lama ke-recreate di Calendar, tidak merusak apa pun di DB eDOXID."""
+
+    def __init__(self, path: str):
+        self._conn = sqlite3.connect(path)
+        self._conn.execute(
+            """
+            CREATE TABLE IF NOT EXISTS sync_state (
+                submission_id INTEGER PRIMARY KEY,
+                event_id TEXT NOT NULL,
+                content_hash TEXT NOT NULL,
+                updated_at TEXT NOT NULL,
+                notified_h1 INTEGER NOT NULL DEFAULT 0,
+                notified_1h INTEGER NOT NULL DEFAULT 0
+            )
+            """
+        )
+        self._conn.commit()
+
+    def close(self) -> None:
+        self._conn.close()
+
+    @staticmethod
+    def compute_hash(submission: dict) -> str:
+        payload = json.dumps(
+            [
+                str(submission["schedule"]),
+                submission["room"],
+                submission["title"],
+                submission["type_id"],
+                submission["student_email"],
+                submission["student_nim"],
+                submission["verificators"],
+            ],
+            sort_keys=True,
+            default=str,
+        )
+        return hashlib.sha256(payload.encode("utf-8")).hexdigest()
+
+    def find(self, submission_id: int) -> dict | None:
+        row = self._conn.execute(
+            "SELECT event_id, content_hash FROM sync_state WHERE submission_id = ?",
+            (submission_id,),
+        ).fetchone()
+        if row is None:
+            return None
+        return {"event_id": row[0], "content_hash": row[1]}
+
+    def save(self, submission_id: int, event_id: str, content_hash: str) -> None:
+        self._conn.execute(
+            """
+            INSERT INTO sync_state (submission_id, event_id, content_hash, updated_at)
+            VALUES (?, ?, ?, ?)
+            """,
+            (submission_id, event_id, content_hash, datetime.utcnow().isoformat()),
+        )
+        self._conn.commit()
+
+    def update_hash(self, submission_id: int, content_hash: str) -> None:
+        self._conn.execute(
+            "UPDATE sync_state SET content_hash = ?, updated_at = ? WHERE submission_id = ?",
+            (content_hash, datetime.utcnow().isoformat(), submission_id),
+        )
+        self._conn.commit()
+
+    def remove(self, submission_id: int) -> None:
+        self._conn.execute("DELETE FROM sync_state WHERE submission_id = ?", (submission_id,))
+        self._conn.commit()
+
+    def is_notified(self, submission_id: int, which: str) -> bool:
+        column = "notified_h1" if which == "h1" else "notified_1h"
+        row = self._conn.execute(
+            f"SELECT {column} FROM sync_state WHERE submission_id = ?", (submission_id,)
+        ).fetchone()
+        return bool(row and row[0])
+
+    def mark_notified(self, submission_id: int, which: str) -> None:
+        column = "notified_h1" if which == "h1" else "notified_1h"
+        self._conn.execute(
+            f"UPDATE sync_state SET {column} = 1 WHERE submission_id = ?", (submission_id,)
+        )
+        self._conn.commit()
+
+    def find_orphaned(self, active_submission_ids: set[int]) -> dict[int, str]:
+        """Submission yang tercatat di state tapi schedule-nya sudah di-null-kan
+        (dibatalkan) atau baris submission-nya sudah dihapus — bukan sekadar
+        tanggalnya lewat. `active_submission_ids` harus dari query TANPA filter
+        tanggal (lihat Database.get_ids_with_active_schedule)."""
+        rows = self._conn.execute("SELECT submission_id, event_id FROM sync_state").fetchall()
+        return {sid: eid for sid, eid in rows if sid not in active_submission_ids}
diff --git a/scripts/edoxid_calendar_sync.py b/scripts/edoxid_calendar_sync.py
new file mode 100644
index 0000000..7720605
--- /dev/null
+++ b/scripts/edoxid_calendar_sync.py
@@ -0,0 +1,127 @@
+import logging
+from datetime import datetime, timedelta
+from zoneinfo import ZoneInfo
+
+from scripts.edoxid_calendar_config import (
+    get_db_config,
+    get_google_config,
+    get_state_sqlite_path,
+    get_sync_min_date,
+)
+from scripts.edoxid_calendar_database import Database
+from scripts.edoxid_calendar_gmail import GmailService
+from scripts.edoxid_calendar_google import (
+    GoogleCalendarService,
+    build_attendee_emails,
+    build_description,
+    format_submission_summary,
+    get_schedule_datetime,
+    get_type_label,
+)
+from scripts.edoxid_calendar_state_store import StateStore
+
+logger = logging.getLogger(__name__)
+
+JAKARTA_TZ = ZoneInfo("Asia/Jakarta")
+
+# Toleransi jendela waktu untuk cek reminder — harus >= interval polling DAG (5 menit)
+# supaya tidak ada window yang "kelewat" di antara 2 run.
+REMINDER_WINDOW = timedelta(minutes=10)
+
+
+def _check_and_send_reminders(submissions: list[dict], state: StateStore, gmail: GmailService) -> int:
+    """Kirim email reminder H-1 (07:00) & 1 jam sebelum ke semua attendee —
+    terpisah dari reminders.overrides Calendar (yang cuma berlaku untuk
+    calendar TU sendiri, tidak ikut ke kalender pribadi tiap attendee)."""
+    now = datetime.now(JAKARTA_TZ)
+    sent = 0
+
+    for submission in submissions:
+        schedule = get_schedule_datetime(submission)
+        h1_time = schedule.replace(hour=7, minute=0, second=0, microsecond=0) - timedelta(days=1)
+        one_hour_time = schedule - timedelta(hours=1)
+        emails = build_attendee_emails(submission)
+        if not emails:
+            continue
+
+        if h1_time <= now < h1_time + REMINDER_WINDOW and not state.is_notified(submission["id"], "h1"):
+            subject = f"[PENGINGAT SEBELUM H-1] {get_type_label(submission)} — {submission['student_name']}"
+            gmail.send(emails, subject, build_description(submission))
+            state.mark_notified(submission["id"], "h1")
+            sent += 1
+            logger.info(
+                "REMINDER H-1 terkirim | submission #%s | %s | penerima: %s",
+                submission["id"], format_submission_summary(submission), ", ".join(emails),
+            )
+
+        if one_hour_time <= now < one_hour_time + REMINDER_WINDOW and not state.is_notified(
+            submission["id"], "1h"
+        ):
+            subject = f"[PENGINGAT 1 JAM SEBELUM] {get_type_label(submission)} — {submission['student_name']}"
+            gmail.send(emails, subject, build_description(submission))
+            state.mark_notified(submission["id"], "1h")
+            sent += 1
+            logger.info(
+                "REMINDER 1-JAM terkirim | submission #%s | %s | penerima: %s",
+                submission["id"], format_submission_summary(submission), ", ".join(emails),
+            )
+
+    return sent
+
+
+def run_sync() -> dict:
+    db = Database(get_db_config())
+    state = StateStore(get_state_sqlite_path())
+    google_config = get_google_config()
+    calendar = GoogleCalendarService(google_config)
+    gmail = GmailService(google_config)
+
+    created = updated = deleted = skipped = 0
+
+    try:
+        submissions = db.get_scheduled_submissions(get_sync_min_date())
+
+        for submission in submissions:
+            content_hash = state.compute_hash(submission)
+            existing = state.find(submission["id"])
+
+            if existing is None:
+                event_id = calendar.create_event(submission)
+                state.save(submission["id"], event_id, content_hash)
+                created += 1
+                logger.info(
+                    "CREATE event %s | submission #%s | %s",
+                    event_id, submission["id"], format_submission_summary(submission),
+                )
+            elif existing["content_hash"] != content_hash:
+                calendar.update_event(existing["event_id"], submission)
+                state.update_hash(submission["id"], content_hash)
+                updated += 1
+                logger.info(
+                    "UPDATE event %s | submission #%s | %s",
+                    existing["event_id"], submission["id"], format_submission_summary(submission),
+                )
+            else:
+                skipped += 1
+
+        active_ids = db.get_ids_with_active_schedule()
+        for submission_id, event_id in state.find_orphaned(active_ids).items():
+            calendar.delete_event(event_id)
+            state.remove(submission_id)
+            deleted += 1
+            logger.info("DELETE submission #%s -> event %s", submission_id, event_id)
+
+        reminders_sent = _check_and_send_reminders(submissions, state, gmail)
+    finally:
+        db.close()
+        state.close()
+
+    summary = {
+        "created": created,
+        "updated": updated,
+        "deleted": deleted,
+        "skipped": skipped,
+        "reminders_sent": reminders_sent,
+    }
+    logger.info("Sync selesai: %s", summary)
+    return summary