test

app.py

@@ -1,3 +1,11 @@
+# app.py (HF Spaces CPU-Optimized)
+# RAG sekolah super hemat CPU:
+# - Default model: 3B instruct (GGUF) + ctx 1024
+# - Retrieval cepat: FAISS top-12 → pilih kalimat pakai lexical overlap (tanpa encode per-kalimat)
+# - Encoder dipakai HANYA untuk query & FAISS (1x per request)
+# - Jawaban final lewat <final>...</final>, stop di </final>, retry kalau kosong/ellipsis
+# - Admin + Auth Postgres tetap sama
+
 import os, json, re, time, logging
 from functools import lru_cache, wraps
 from typing import Dict, List, Tuple
@@ -7,7 +15,7 @@ from zoneinfo import ZoneInfo
 from pathlib import Path
 
 from flask import (
-Flask, render_template, request, redirect, url_for, session, jsonify, flash
+    Flask, render_template, request, redirect, url_for, session, jsonify, flash
 )
 
 import numpy as np
@@ -19,29 +27,25 @@ from dotenv import load_dotenv
 load_dotenv()
 
 # ========= ENV & LOGGING =========
-
 os.environ.setdefault("KMP_DUPLICATE_LIB_OK", "TRUE")
 os.environ.setdefault("OMP_NUM_THREADS", "1")
 try:
-torch.set_num_threads(int(os.environ.get("NUM_THREADS", "3")))  # 3 thread cukup di CPU Spaces
-torch.set_num_interop_threads(1)
+    torch.set_num_threads(int(os.environ.get("NUM_THREADS", "3")))  # 3 thread cukup di CPU Spaces
+    torch.set_num_interop_threads(1)
 except Exception:
-pass
+    pass
 
-logging.basicConfig([level=logging.INFO](http://level=logging.info/), format="%(asctime)s | %(levelname)s | %(message)s")
+logging.basicConfig(level=logging.INFO, format="%(asctime)s | %(levelname)s | %(message)s")
 log = logging.getLogger("rag-app")
 
 # ========= IMPORT EKSTERNAL (wrapper & guardrail) =========
-
 from Guardrail import validate_input           # -> bool
 from Model import load_model, generate         # -> llama.cpp wrapper
 
 # ========= PATH ROOT =========
-
-BASE_DIR = Path(**file**).resolve().parent
+BASE_DIR = Path(__file__).resolve().parent
 
 # ========= KONFIG MODEL & RAG (di-tune untuk CPU) =========
-
 GGUF_DEFAULT = "DeepSeek-R1-Distill-Qwen-7B-Q4_K_M.gguf"  # kecil & cepat; upload ke /models
 MODEL_PATH   = str(BASE_DIR / "models" / os.getenv("GGUF_FILENAME", GGUF_DEFAULT))
 CTX_WINDOW   = int(os.environ.get("CTX_WINDOW", 1024))
@@ -52,287 +56,282 @@ ENCODER_NAME   = os.environ.get("ENCODER_NAME", "intfloat/multilingual-e5-large"
 ENCODER_DEVICE = torch.device("cpu")
 
 # Dataset sudah ada di Space → path RELATIF (samakan dengan struktur kamu)
-
 SUBJECTS: Dict[str, Dict[str, str]] = {
-"ipas": {
-"index": str(BASE_DIR / "Rag-Pipeline" / "Vektor Database" / "Ipas" / "IPA_index.index"),
-"chunks": str(BASE_DIR / "Dataset" / "Ipas" / "Chunk" / "ipas_chunks.json"),
-"embeddings": str(BASE_DIR / "Dataset" / "Ipas" / "Embedd"/ "ipas_embeddings.npy"),
-"label": "IPAS",
-"desc": "Ilmu Pengetahuan Alam dan Sosial"
-},
-"penjas": {
-"index": str(BASE_DIR / "Rag-Pipeline" / "Vektor Database" / "Penjas" / "PENJAS_index.index"),
-"chunks": str(BASE_DIR / "Dataset" / "Penjas" / "Chunk" / "penjas_chunks.json"),
-"embeddings": str(BASE_DIR / "Dataset" / "Penjas" / "Embedd" / "penjas_embeddings.npy"),
-"label": "PJOK",
-"desc": "Pendidikan Jasmani, Olahraga, dan Kesehatan"
-},
-"pancasila": {
-"index": str(BASE_DIR / "Rag-Pipeline" / "Vektor Database" / "Pancasila" / "PANCASILA_index.index"),
-"chunks": str(BASE_DIR / "Dataset" / "Pancasila" / "Chunk" / "pancasila_chunks.json"),
-"embeddings": str(BASE_DIR / "Dataset" / "Pancasila" / "Embedd" / "pancasila_embeddings.npy"),
-"label": "PANCASILA",
-"desc": "Pendidikan Pancasila dan Kewarganegaraan"
-}
+    "ipas": {
+        "index": str(BASE_DIR / "Rag-Pipeline" / "Vektor Database" / "Ipas" / "IPA_index.index"),
+        "chunks": str(BASE_DIR / "Dataset" / "Ipas" / "Chunk" / "ipas_chunks.json"),
+        "embeddings": str(BASE_DIR / "Dataset" / "Ipas" / "Embedd"/ "ipas_embeddings.npy"),
+        "label": "IPAS",
+        "desc": "Ilmu Pengetahuan Alam dan Sosial"
+    },
+    "penjas": {
+        "index": str(BASE_DIR / "Rag-Pipeline" / "Vektor Database" / "Penjas" / "PENJAS_index.index"),
+        "chunks": str(BASE_DIR / "Dataset" / "Penjas" / "Chunk" / "penjas_chunks.json"),
+        "embeddings": str(BASE_DIR / "Dataset" / "Penjas" / "Embedd" / "penjas_embeddings.npy"),
+        "label": "PJOK",
+        "desc": "Pendidikan Jasmani, Olahraga, dan Kesehatan"
+    },
+    "pancasila": {
+        "index": str(BASE_DIR / "Rag-Pipeline" / "Vektor Database" / "Pancasila" / "PANCASILA_index.index"),
+        "chunks": str(BASE_DIR / "Dataset" / "Pancasila" / "Chunk" / "pancasila_chunks.json"),
+        "embeddings": str(BASE_DIR / "Dataset" / "Pancasila" / "Embedd" / "pancasila_embeddings.npy"),
+        "label": "PANCASILA",
+        "desc": "Pendidikan Pancasila dan Kewarganegaraan"
+    }
 }
 
 # Threshold & parameter cepat
-
 TOP_K_FAISS   = int(os.environ.get("TOP_K_FAISS", 15))
 TOP_K_FINAL   = int(os.environ.get("TOP_K_FINAL", 10))
-MIN_COSINE    = float(os.environ.get("MIN_COSINE", 0.83))  # lebih longgar biar jarang fallback
-MIN_LEXICAL   = float(os.environ.get("MIN_LEXICAL", 0.10))
+MIN_COSINE    = float(os.environ.get("MIN_COSINE", 0.83))  # sedikit lebih longgar biar jarang fallback
+MIN_LEXICAL   = float(os.environ.get("MIN_LEXICAL", 0.8))
 FALLBACK_TEXT = os.environ.get("FALLBACK_TEXT", "maap pengetahuan tidak ada dalam database")
 GUARDRAIL_BLOCK_TEXT = os.environ.get("GUARDRAIL_BLOCK_TEXT", "maap, pertanyaan ditolak oleh guardrail")
 ENABLE_PROFILING = os.environ.get("ENABLE_PROFILING", "false").lower() == "true"
 
 # ========= APP =========
-
-app = Flask(**name**)
+app = Flask(__name__)
 app.secret_key = os.environ.get("FLASK_SECRET_KEY", "dev-secret-please-change")
 
 from werkzeug.middleware.proxy_fix import ProxyFix
 app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1)
 app.config.update(
-SESSION_COOKIE_NAME="session",
-SESSION_COOKIE_SAMESITE="None",
-SESSION_COOKIE_SECURE=True,
-SESSION_COOKIE_HTTPONLY=True,
-SESSION_COOKIE_PATH="/",
-PREFERRED_URL_SCHEME="https",
+    SESSION_COOKIE_NAME="session",
+    SESSION_COOKIE_SAMESITE="None",
+    SESSION_COOKIE_SECURE=True,
+    SESSION_COOKIE_HTTPONLY=True,
+    SESSION_COOKIE_PATH="/",
+    PREFERRED_URL_SCHEME="https",
 )
 
 # ========= GLOBALS =========
-
 ENCODER_TOKENIZER = None
 ENCODER_MODEL     = None
 LLM               = None
 
 @dataclass(frozen=True)
 class SubjectAssets:
-index: faiss.Index
-texts: List[str]
-embs: np.ndarray
+    index: faiss.Index
+    texts: List[str]
+    embs: np.ndarray
 
 # ========= TEKS UTIL =========
-
 STOPWORDS_ID = {
-"yang","dan","atau","pada","di","ke","dari","itu","ini","adalah","dengan",
-"untuk","serta","sebagai","oleh","dalam","akan","kamu","apa","karena",
-"agar","sehingga","terhadap","dapat","juga","para","diri",
+    "yang","dan","atau","pada","di","ke","dari","itu","ini","adalah","dengan",
+    "untuk","serta","sebagai","oleh","dalam","akan","kamu","apa","karena",
+    "agar","sehingga","terhadap","dapat","juga","para","diri",
 }
 TOKEN_RE = re.compile(r"[A-Za-zÀ-ÖØ-öø-ÿ]+", re.UNICODE)
 
 @lru_cache(maxsize=4096)
 def _tok_cached(word: str) -> str:
-return word.lower()
+    # cache lowercase
+    return word.lower()
 
 def tok_id(text: str) -> List[str]:
-return [tw for w in TOKEN_RE.findall(text or "") if (tw:=_tok_cached(w)) not in STOPWORDS_ID]
+    return [tw for w in TOKEN_RE.findall(text or "") if (tw:=_tok_cached(w)) not in STOPWORDS_ID]
 
 def lexical_overlap(query: str, sent: str) -> float:
-q = set(tok_id(query)); s = set(tok_id(sent))
-if not q or not s:
-return 0.0
-return len(q & s) / max(1, len(q | s))
+    q = set(tok_id(query)); s = set(tok_id(sent))
+    if not q or not s:
+        return 0.0
+    return len(q & s) / max(1, len(q | s))
 
 QUESTION_LIKE_RE = re.compile(r"(^\s*(apa|mengapa|bagaimana|sebutkan|jelaskan)\b|[?]$)", re.IGNORECASE)
 INSTRUCTION_RE   = re.compile(r"\b(jelaskan|sebutkan|uraikan|kerjakan|diskusikan|tugas|latihan|menurut\s+pendapatmu)\b", re.IGNORECASE)
 META_PREFIX_PATTERNS = [
-r"berdasarkan\s+(?:kalimat|sumber|teks|konten|informasi)(?:\s+(?:di\s+atas|tersebut))?",
-r"menurut\s+(?:sumber|teks|konten)",
-r"merujuk\s+pada",
-r"mengacu\s+pada",
-r"bersumber\s+dari",
-r"dari\s+(?:kalimat|sumber|teks|konten)"
+    r"berdasarkan\s+(?:kalimat|sumber|teks|konten|informasi)(?:\s+(?:di\s+atas|tersebut))?",
+    r"menurut\s+(?:sumber|teks|konten)",
+    r"merujuk\s+pada",
+    r"mengacu\s+pada",
+    r"bersumber\s+dari",
+    r"dari\s+(?:kalimat|sumber|teks|konten)"
 ]
 META_PREFIX_RE = re.compile(r"^\s*(?:" + r"|".join(META_PREFIX_PATTERNS) + r")\s*[:\-–—,]?\s*", re.IGNORECASE)
 
 def clean_prefix(t: str) -> str:
-t = (t or "").strip()
-for _ in range(3):
-t2 = META_PREFIX_RE.sub("", t).lstrip()
-if t2 == t:
-break
-t = t2
-return t
+    t = (t or "").strip()
+    for _ in range(3):
+        t2 = META_PREFIX_RE.sub("", t).lstrip()
+        if t2 == t:
+            break
+        t = t2
+    return t
 
 def strip_meta_sentence(s: str) -> str:
-s = clean_prefix(s or "")
-if re.match(r"^\s*(berdasarkan|menurut|merujuk|mengacu|bersumber|dari)\b", s, re.IGNORECASE):
-s = re.sub(r"^\s*[^,.;!?]*[,.;!?]\s*", "", s) or s
-s = clean_prefix(s)
-return s.strip()
+    s = clean_prefix(s or "")
+    if re.match(r"^\s*(berdasarkan|menurut|merujuk|mengacu|bersumber|dari)\b", s, re.IGNORECASE):
+        s = re.sub(r"^\s*[^,.;!?]*[,.;!?]\s*", "", s) or s
+    s = clean_prefix(s)
+    return s.strip()
 
 SENT_SPLIT_RE = re.compile(r"(?<=[.!?])\s+")
 
 def split_sentences_fast(text: str) -> List[str]:
-# tanpa encoding per-kalimat
-outs = []
-for p in SENT_SPLIT_RE.split(text or ""):
-s = clean_prefix((p or "").strip())
-if not s:
-continue
-if s[-1] not in ".!?":
-s += "."
-if QUESTION_LIKE_RE.search(s):
-continue
-if INSTRUCTION_RE.search(s):
-continue
-if len(s) < 12:
-continue
-outs.append(s)
-return outs
+    # tanpa encoding per-kalimat
+    outs = []
+    for p in SENT_SPLIT_RE.split(text or ""):
+        s = clean_prefix((p or "").strip())
+        if not s:
+            continue
+        if s[-1] not in ".!?":
+            s += "."
+        if QUESTION_LIKE_RE.search(s):
+            continue
+        if INSTRUCTION_RE.search(s):
+            continue
+        if len(s) < 12:
+            continue
+        outs.append(s)
+    return outs
 
 # ========= MODEL WARMUP =========
 
 def warmup_models():
-global ENCODER_TOKENIZER, ENCODER_MODEL, LLM
-if ENCODER_TOKENIZER is None or ENCODER_MODEL is None:
-[log.info](http://log.info/)(f"[INIT] Load encoder: {ENCODER_NAME} (CPU)")
-ENCODER_TOKENIZER = AutoTokenizer.from_pretrained(ENCODER_NAME)
-ENCODER_MODEL = AutoModel.from_pretrained(ENCODER_NAME).to(ENCODER_DEVICE).eval()
-if LLM is None:
-[log.info](http://log.info/)(f"[INIT] Load LLM: {MODEL_PATH} | ctx={CTX_WINDOW} | threads={N_THREADS}")
-LLM = load_model(MODEL_PATH, n_ctx=CTX_WINDOW, n_gpu_layers=N_GPU_LAYERS, n_threads=N_THREADS)
+    global ENCODER_TOKENIZER, ENCODER_MODEL, LLM
+    if ENCODER_TOKENIZER is None or ENCODER_MODEL is None:
+        log.info(f"[INIT] Load encoder: {ENCODER_NAME} (CPU)")
+        ENCODER_TOKENIZER = AutoTokenizer.from_pretrained(ENCODER_NAME)
+        ENCODER_MODEL = AutoModel.from_pretrained(ENCODER_NAME).to(ENCODER_DEVICE).eval()
+    if LLM is None:
+        log.info(f"[INIT] Load LLM: {MODEL_PATH} | ctx={CTX_WINDOW} | threads={N_THREADS}")
+        LLM = load_model(MODEL_PATH, n_ctx=CTX_WINDOW, n_gpu_layers=N_GPU_LAYERS, n_threads=N_THREADS)
 
 # ========= ASSETS =========
 
 @lru_cache(maxsize=8)
 def load_subject_assets(subject_key: str) -> "SubjectAssets":
-if subject_key not in SUBJECTS:
-raise ValueError(f"Unknown subject: {subject_key}")
-cfg = SUBJECTS[subject_key]
-[log.info](http://log.info/)(f"[ASSETS] Loading subject={subject_key} | index={cfg['index']}")
-if not os.path.exists(cfg["index"]):
-raise FileNotFoundError(cfg["index"])
-if not os.path.exists(cfg["chunks"]):
-raise FileNotFoundError(cfg["chunks"])
-if not os.path.exists(cfg["embeddings"]):
-raise FileNotFoundError(cfg["embeddings"])
-index = faiss.read_index(cfg["index"])
-with open(cfg["chunks"], "r", encoding="utf-8") as f:
-texts = [it.get("text", "") for it in json.load(f)]
-embs = np.load(cfg["embeddings"])  # (N, dim)
-if index.ntotal != len(embs):
-raise RuntimeError(f"Mismatch ntotal({index.ntotal}) vs emb({len(embs)})")
-return SubjectAssets(index=index, texts=texts, embs=embs)
+    if subject_key not in SUBJECTS:
+        raise ValueError(f"Unknown subject: {subject_key}")
+    cfg = SUBJECTS[subject_key]
+    log.info(f"[ASSETS] Loading subject={subject_key} | index={cfg['index']}")
+    if not os.path.exists(cfg["index"]):
+        raise FileNotFoundError(cfg["index"])
+    if not os.path.exists(cfg["chunks"]):
+        raise FileNotFoundError(cfg["chunks"])
+    if not os.path.exists(cfg["embeddings"]):
+        raise FileNotFoundError(cfg["embeddings"])
+    index = faiss.read_index(cfg["index"])
+    with open(cfg["chunks"], "r", encoding="utf-8") as f:
+        texts = [it.get("text", "") for it in json.load(f)]
+    embs = np.load(cfg["embeddings"])  # (N, dim)
+    if index.ntotal != len(embs):
+        raise RuntimeError(f"Mismatch ntotal({index.ntotal}) vs emb({len(embs)})")
+    return SubjectAssets(index=index, texts=texts, embs=embs)
 
 # ========= ENCODER =========
 
 @torch.inference_mode()
 @lru_cache(maxsize=1024)
 def encode_query_exact(text: str) -> np.ndarray:
-toks = ENCODER_TOKENIZER(text, padding=True, truncation=True, return_tensors="pt").to(ENCODER_DEVICE)
-out = ENCODER_MODEL(**toks)
-vec = out.last_hidden_state.mean(dim=1)
-return vec.cpu().numpy()
+    toks = ENCODER_TOKENIZER(text, padding=True, truncation=True, return_tensors="pt").to(ENCODER_DEVICE)
+    out = ENCODER_MODEL(**toks)
+    vec = out.last_hidden_state.mean(dim=1)
+    return vec.cpu().numpy()
 
 def cosine_sim(a: np.ndarray, b: np.ndarray) -> float:
-a = np.asarray(a).reshape(-1); b = np.asarray(b).reshape(-1)
-denom = (np.linalg.norm(a) * np.linalg.norm(b)) + 1e-12
-return float(np.dot(a, b) / denom)
+    a = np.asarray(a).reshape(-1); b = np.asarray(b).reshape(-1)
+    denom = (np.linalg.norm(a) * np.linalg.norm(b)) + 1e-12
+    return float(np.dot(a, b) / denom)
 
 # ========= RETRIEVAL CEPAT =========
 
 def best_cosine_from_faiss(query: str, subject_key: str) -> float:
-assets = load_subject_assets(subject_key)
-q = encode_query_exact(query)
-_, I = assets.index.search(q, TOP_K_FAISS)
-qv = q.reshape(-1)
-best = -1.0
-for i in I[0]:
-if 0 <= i < len(assets.texts):
-best = max(best, cosine_sim(qv, assets.embs[i]))
-return best
+    assets = load_subject_assets(subject_key)
+    q = encode_query_exact(query)
+    _, I = assets.index.search(q, TOP_K_FAISS)
+    qv = q.reshape(-1)
+    best = -1.0
+    for i in I[0]:
+        if 0 <= i < len(assets.texts):
+            best = max(best, cosine_sim(qv, assets.embs[i]))
+    return best
 
 def retrieve_top_chunks(query: str, subject_key: str) -> List[str]:
-assets = load_subject_assets(subject_key)
-q = encode_query_exact(query)
-_, idx = assets.index.search(q, TOP_K_FAISS)
-idxs = [i for i in idx[0] if 0 <= i < len(assets.texts)]
-return [assets.texts[i] for i in idxs[:TOP_K_FINAL]]
+    assets = load_subject_assets(subject_key)
+    q = encode_query_exact(query)
+    _, idx = assets.index.search(q, TOP_K_FAISS)
+    idxs = [i for i in idx[0] if 0 <= i < len(assets.texts)]
+    return [assets.texts[i] for i in idxs[:TOP_K_FINAL]]
 
 def pick_best_sentences_fast(query: str, chunks: List[str], top_k: int = 4) -> List[str]:
-# Tanpa encode per kalimat — hanya lexical overlap + panjang wajar
-cands: List[Tuple[float, str]] = []
-for ch in chunks:
-for s in split_sentences_fast(ch):
-ovl = lexical_overlap(query, s)
-if ovl < MIN_LEXICAL:
-continue
-# bonus sedikit kalau kalimat panjang wajar (50–220 char)
-L = len(s)
-len_bonus = 0.05 if 50 <= L <= 220 else 0.0
-score = ovl + len_bonus
-cands.append((score, s))
-cands.sort(key=lambda x: x[0], reverse=True)
-return [s for _, s in cands[:top_k]]
+    # Tanpa encode per kalimat — hanya lexical overlap + panjang wajar
+    cands: List[Tuple[float, str]] = []
+    for ch in chunks:
+        for s in split_sentences_fast(ch):
+            ovl = lexical_overlap(query, s)
+            if ovl < MIN_LEXICAL:
+                continue
+            # bonus sedikit kalau kalimat panjang wajar (50–220 char)
+            L = len(s)
+            len_bonus = 0.05 if 50 <= L <= 220 else 0.0
+            score = ovl + len_bonus
+            cands.append((score, s))
+    cands.sort(key=lambda x: x[0], reverse=True)
+    return [s for _, s in cands[:top_k]]
 
 # ========= PROMPT =========
 
 def build_prompt(user_query: str, sentences: List[str]) -> str:
-block = "\n".join(f"- {clean_prefix(s)}" for s in sentences)
-system = (
-"Kamu asisten RAG.\n"
-f"- Jika tidak ada kalimat yang relevan, tulis persis: {FALLBACK_TEXT}\n"
-"- Jawab TEPAT 1 kalimat, ringkas, Bahasa Indonesia baku (≥ 6 kata).\n"
-"- Tanpa frasa meta (berdasarkan/menurut/merujuk/mengacu/bersumber).\n"
-"- Tulis jawaban final di dalam tag <final>Jawaban.</final> dan jangan menulis apa pun setelah </final>."
-)
-fewshot = (
-"Contoh format: \n"
-"KALIMAT SUMBER:\n- Air memuai saat dipanaskan.\n"
-"PERTANYAAN: Apa yang terjadi pada air saat dipanaskan?\n"
-"<final>Air akan memuai ketika dipanaskan.</final>\n"
-)
-return (
-f"{system}\n\n{fewshot}\n"
-f"KALIMAT SUMBER:\n{block}\n\n"
-f"PERTANYAAN: {user_query}\n"
-f"TULIS JAWABAN DI DALAM <final>...</final> SAJA:"
-)
+    block = "\n".join(f"- {clean_prefix(s)}" for s in sentences)
+    system = (
+        "Kamu asisten RAG.\n"
+        f"- Jika tidak ada kalimat yang relevan, tulis persis: {FALLBACK_TEXT}\n"
+        "- Jawab TEPAT 1 kalimat, ringkas, Bahasa Indonesia baku (≥ 6 kata).\n"
+        "- Tanpa frasa meta (berdasarkan/menurut/merujuk/mengacu/bersumber).\n"
+        "- Tulis jawaban final di dalam tag <final>Jawaban.</final> dan jangan menulis apa pun setelah </final>."
+    )
+    fewshot = (
+        "Contoh format: \n"
+        "KALIMAT SUMBER:\n- Air memuai saat dipanaskan.\n"
+        "PERTANYAAN: Apa yang terjadi pada air saat dipanaskan?\n"
+        "<final>Air akan memuai ketika dipanaskan.</final>\n"
+    )
+    return (
+        f"{system}\n\n{fewshot}\n"
+        f"KALIMAT SUMBER:\n{block}\n\n"
+        f"PERTANYAAN: {user_query}\n"
+        f"TULIS JAWABAN DI DALAM <final>...</final> SAJA:"
+    )
 
 @lru_cache(maxsize=1024)
 def validate_input_cached(q: str) -> bool:
-try:
-return validate_input(q)
-except Exception as e:
-log.exception(f"[GUARDRAIL] error: {e}")
-return False
+    try:
+        return validate_input(q)
+    except Exception as e:
+        log.exception(f"[GUARDRAIL] error: {e}")
+        return False
 
 # ========= AUTH (POSTGRES) =========
-
 from werkzeug.security import generate_password_hash, check_password_hash
 from sqlalchemy import create_engine, Column, Integer, String, Text, Boolean, func, or_
 from sqlalchemy.orm import sessionmaker, scoped_session, declarative_base, Session
 
 POSTGRES_URL = os.environ.get("POSTGRES_URL")
 if not POSTGRES_URL:
-raise RuntimeError("POSTGRES_URL tidak ditemukan. Set di Settings → Variables.")
+    raise RuntimeError("POSTGRES_URL tidak ditemukan. Set di Settings → Variables.")
 
 engine = create_engine(POSTGRES_URL, pool_pre_ping=True, future=True, echo=False)
 SessionLocal = scoped_session(sessionmaker(bind=engine, autoflush=False, autocommit=False, future=True))
 Base = declarative_base()
 
 class User(Base):
-**tablename** = "users"
-id = Column(Integer, primary_key=True)
-username = Column(String(50), unique=True, nullable=False, index=True)
-email = Column(String(120), unique=True, nullable=False, index=True)
-password = Column(Text, nullable=False)
-is_active = Column(Boolean, default=True, nullable=False)
-is_admin  = Column(Boolean, default=False, nullable=False)
+    __tablename__ = "users"
+    id = Column(Integer, primary_key=True)
+    username = Column(String(50), unique=True, nullable=False, index=True)
+    email = Column(String(120), unique=True, nullable=False, index=True)
+    password = Column(Text, nullable=False)
+    is_active = Column(Boolean, default=True, nullable=False)
+    is_admin  = Column(Boolean, default=False, nullable=False)
 
 class ChatHistory(Base):
-**tablename** = "chat_history"
-id = Column(Integer, primary_key=True)
-user_id = Column(Integer, nullable=False, index=True)
-subject_key = Column(String(50), nullable=False, index=True)
-role = Column(String(10), nullable=False)
-message = Column(Text, nullable=False)
-timestamp = Column(Integer, server_default=func.extract("epoch", func.now()))
+    __tablename__ = "chat_history"
+    id = Column(Integer, primary_key=True)
+    user_id = Column(Integer, nullable=False, index=True)
+    subject_key = Column(String(50), nullable=False, index=True)
+    role = Column(String(10), nullable=False)
+    message = Column(Text, nullable=False)
+    timestamp = Column(Integer, server_default=func.extract("epoch", func.now()))
 
 Base.metadata.create_all(bind=engine)
 
@@ -340,441 +339,435 @@ JKT_TZ = ZoneInfo("Asia/Jakarta")
 
 @app.template_filter("fmt_ts")
 def fmt_ts(epoch_int: int):
-try:
-dt = datetime.fromtimestamp(int(epoch_int), tz=JKT_TZ)
-return dt.strftime("%d %b %Y %H:%M")
-except Exception:
-return "-"
+    try:
+        dt = datetime.fromtimestamp(int(epoch_int), tz=JKT_TZ)
+        return dt.strftime("%d %b %Y %H:%M")
+    except Exception:
+        return "-"
 
 def db():
-return SessionLocal()
+    return SessionLocal()
 
 def login_required(view_func):
-@wraps(view_func)
-def wrapper(*args, **kwargs):
-if not session.get("logged_in"):
-return redirect(url_for("auth_login"))
-return view_func(*args, **kwargs)
-return wrapper
+    @wraps(view_func)
+    def wrapper(*args, **kwargs):
+        if not session.get("logged_in"):
+            return redirect(url_for("auth_login"))
+        return view_func(*args, **kwargs)
+    return wrapper
 
 def admin_required(view_func):
-@wraps(view_func)
-def wrapper(*args, **kwargs):
-if not session.get("logged_in"):
-return redirect(url_for("auth_login"))
-if not session.get("is_admin"):
-flash("Hanya admin yang boleh mengakses halaman itu.", "error")
-return redirect(url_for("subjects"))
-return view_func(*args, **kwargs)
-return wrapper
+    @wraps(view_func)
+    def wrapper(*args, **kwargs):
+        if not session.get("logged_in"):
+            return redirect(url_for("auth_login"))
+        if not session.get("is_admin"):
+            flash("Hanya admin yang boleh mengakses halaman itu.", "error")
+            return redirect(url_for("subjects"))
+        return view_func(*args, **kwargs)
+    return wrapper
 
 # ========= ROUTES =========
-
 @app.route("/")
 def root():
-return redirect(url_for("auth_login"))
+    return redirect(url_for("auth_login"))
 
 @app.route("/auth/login", methods=["GET", "POST"])
 def auth_login():
-if request.method == "POST":
-identity = (
-request.form.get("identity") or request.form.get("email") or request.form.get("username") or ""
-).strip().lower()
-pw_input = (request.form.get("password") or "").strip()
-if not identity or not pw_input:
-flash("Mohon isi email/username dan password.", "error")
-return render_template("login.html"), 400
-s = db()
-try:
-user = (
-s.query(User)
-.filter(or_(func.lower(User.username) == identity, func.lower(User.email) == identity))
-.first()
-)
-[log.info](http://log.info/)(f"[LOGIN] identity='{identity}' found={bool(user)} active={getattr(user,'is_active',None)}")
-ok = bool(user and user.is_active and check_password_hash(user.password, pw_input))
-finally:
-s.close()
-if not ok:
-flash("Identitas atau password salah.", "error")
-return render_template("login.html"), 401
-session["logged_in"] = True
-session["user_id"] = [user.id](http://user.id/)
-session["username"] = user.username
-session["is_admin"] = bool(user.is_admin)
-[log.info](http://log.info/)(f"[LOGIN] OK user_id={[user.id](http://user.id/)}; session set.")
-return redirect(url_for("subjects"))
-return render_template("login.html")
+    if request.method == "POST":
+        identity = (
+            request.form.get("identity") or request.form.get("email") or request.form.get("username") or ""
+        ).strip().lower()
+        pw_input = (request.form.get("password") or "").strip()
+        if not identity or not pw_input:
+            flash("Mohon isi email/username dan password.", "error")
+            return render_template("login.html"), 400
+        s = db()
+        try:
+            user = (
+                s.query(User)
+                .filter(or_(func.lower(User.username) == identity, func.lower(User.email) == identity))
+                .first()
+            )
+            log.info(f"[LOGIN] identity='{identity}' found={bool(user)} active={getattr(user,'is_active',None)}")
+            ok = bool(user and user.is_active and check_password_hash(user.password, pw_input))
+        finally:
+            s.close()
+        if not ok:
+            flash("Identitas atau password salah.", "error")
+            return render_template("login.html"), 401
+        session["logged_in"] = True
+        session["user_id"] = user.id
+        session["username"] = user.username
+        session["is_admin"] = bool(user.is_admin)
+        log.info(f"[LOGIN] OK user_id={user.id}; session set.")
+        return redirect(url_for("subjects"))
+    return render_template("login.html")
 
 @app.route("/whoami")
 def whoami():
-return {
-"logged_in": bool(session.get("logged_in")),
-"user_id": session.get("user_id"),
-"username": session.get("username"),
-"is_admin": session.get("is_admin"),
-}
+    return {
+        "logged_in": bool(session.get("logged_in")),
+        "user_id": session.get("user_id"),
+        "username": session.get("username"),
+        "is_admin": session.get("is_admin"),
+    }
 
 @app.route("/auth/register", methods=["GET", "POST"])
 def auth_register():
-if request.method == "POST":
-username = (request.form.get("username") or "").strip().lower()
-email    = (request.form.get("email") or "").strip().lower()
-pw       = (request.form.get("password") or "").strip()
-confirm  = (request.form.get("confirm") or "").strip()
-if not username or not email or not pw:
-flash("Semua field wajib diisi.", "error")
-return render_template("register.html"), 400
-if len(pw) < 6:
-flash("Password minimal 6 karakter.", "error")
-return render_template("register.html"), 400
-if pw != confirm:
-flash("Konfirmasi password tidak cocok.", "error")
-return render_template("register.html"), 400
-s = db()
-try:
-existed = (
-s.query(User)
-.filter(or_(func.lower(User.username) == username, func.lower(User.email) == email))
-.first()
-)
-if existed:
-flash("Username/Email sudah terpakai.", "error")
-return render_template("register.html"), 409
-u = User(username=username, email=email, password=generate_password_hash(pw), is_active=True)
-s.add(u); s.commit()
-finally:
-s.close()
-flash("Registrasi berhasil. Silakan login.", "success")
-return redirect(url_for("auth_login"))
-return render_template("register.html")
+    if request.method == "POST":
+        username = (request.form.get("username") or "").strip().lower()
+        email    = (request.form.get("email") or "").strip().lower()
+        pw       = (request.form.get("password") or "").strip()
+        confirm  = (request.form.get("confirm") or "").strip()
+        if not username or not email or not pw:
+            flash("Semua field wajib diisi.", "error")
+            return render_template("register.html"), 400
+        if len(pw) < 6:
+            flash("Password minimal 6 karakter.", "error")
+            return render_template("register.html"), 400
+        if pw != confirm:
+            flash("Konfirmasi password tidak cocok.", "error")
+            return render_template("register.html"), 400
+        s = db()
+        try:
+            existed = (
+                s.query(User)
+                .filter(or_(func.lower(User.username) == username, func.lower(User.email) == email))
+                .first()
+            )
+            if existed:
+                flash("Username/Email sudah terpakai.", "error")
+                return render_template("register.html"), 409
+            u = User(username=username, email=email, password=generate_password_hash(pw), is_active=True)
+            s.add(u); s.commit()
+        finally:
+            s.close()
+        flash("Registrasi berhasil. Silakan login.", "success")
+        return redirect(url_for("auth_login"))
+    return render_template("register.html")
 
 @app.route("/auth/logout")
 def auth_logout():
-session.clear()
-return redirect(url_for("auth_login"))
+    session.clear()
+    return redirect(url_for("auth_login"))
 
 @app.route("/about")
 def about():
-return render_template("about.html")
+    return render_template("about.html")
 
 @app.route("/subjects")
 @login_required
 def subjects():
-[log.info](http://log.info/)(f"[SESSION DEBUG] logged_in={session.get('logged_in')} user_id={session.get('user_id')}")
-return render_template("home.html", subjects=SUBJECTS)
+    log.info(f"[SESSION DEBUG] logged_in={session.get('logged_in')} user_id={session.get('user_id')}")
+    return render_template("home.html", subjects=SUBJECTS)
 
 @app.route("/chat/<subject_key>")
 @login_required
 def chat_subject(subject_key: str):
-if subject_key not in SUBJECTS:
-return redirect(url_for("subjects"))
-session["subject_selected"] = subject_key
-label = SUBJECTS[subject_key]["label"]
-s = db()
-try:
-uid = session.get("user_id")
-rows = (
-s.query(ChatHistory)
-.filter_by(user_id=uid, subject_key=subject_key)
-.order_by(ChatHistory.id.asc())
-.all()
-)
-history = [{"role": r.role, "message": r.message} for r in rows]
-finally:
-s.close()
-return render_template("chat.html", subject=subject_key, subject_label=label, history=history)
+    if subject_key not in SUBJECTS:
+        return redirect(url_for("subjects"))
+    session["subject_selected"] = subject_key
+    label = SUBJECTS[subject_key]["label"]
+    s = db()
+    try:
+        uid = session.get("user_id")
+        rows = (
+            s.query(ChatHistory)
+            .filter_by(user_id=uid, subject_key=subject_key)
+            .order_by(ChatHistory.id.asc())
+            .all()
+        )
+        history = [{"role": r.role, "message": r.message} for r in rows]
+    finally:
+        s.close()
+    return render_template("chat.html", subject=subject_key, subject_label=label, history=history)
 
 @app.route("/health")
 def health():
-return jsonify({
-"ok": True,
-"encoder_loaded": ENCODER_MODEL is not None,
-"llm_loaded": LLM is not None,
-"model_path": MODEL_PATH,
-"ctx_window": CTX_WINDOW,
-"threads": N_THREADS,
-})
+    return jsonify({
+        "ok": True,
+        "encoder_loaded": ENCODER_MODEL is not None,
+        "llm_loaded": LLM is not None,
+        "model_path": MODEL_PATH,
+        "ctx_window": CTX_WINDOW,
+        "threads": N_THREADS,
+    })
 
 @app.route("/ask/<subject_key>", methods=["POST"])
 @login_required
 def ask(subject_key: str):
-if subject_key not in SUBJECTS:
-return jsonify({"ok": False, "error": "invalid subject"}), 400
-warmup_models()
-t0 = time.perf_counter()
-
-```
-data = request.get_json(silent=True) or {}
-query = (data.get("message") or "").strip()
-if not query:
-    return jsonify({"ok": False, "error": "empty query"}), 400
-if not validate_input_cached(query):
-    return jsonify({"ok": True, "answer": GUARDRAIL_BLOCK_TEXT})
+    if subject_key not in SUBJECTS:
+        return jsonify({"ok": False, "error": "invalid subject"}), 400
+    warmup_models()
+    t0 = time.perf_counter()
+
+    data = request.get_json(silent=True) or {}
+    query = (data.get("message") or "").strip()
+    if not query:
+        return jsonify({"ok": False, "error": "empty query"}), 400
+    if not validate_input_cached(query):
+        return jsonify({"ok": True, "answer": GUARDRAIL_BLOCK_TEXT})
 
-try:
-    _ = load_subject_assets(subject_key)
-except Exception as e:
-    log.exception(f"[ASSETS] error: {e}")
-    return jsonify({"ok": False, "error": f"subject assets error: {e}"}), 500
-
-best = best_cosine_from_faiss(query, subject_key)
-log.info(f"[RAG] Subject={subject_key.upper()} | Best cosine={best:.3f}")
-if best < MIN_COSINE:
-    return jsonify({"ok": True, "answer": FALLBACK_TEXT})
+    try:
+        _ = load_subject_assets(subject_key)
+    except Exception as e:
+        log.exception(f"[ASSETS] error: {e}")
+        return jsonify({"ok": False, "error": f"subject assets error: {e}"}), 500
 
-chunks = retrieve_top_chunks(query, subject_key)
-if not chunks:
-    return jsonify({"ok": True, "answer": FALLBACK_TEXT})
+    best = best_cosine_from_faiss(query, subject_key)
+    log.info(f"[RAG] Subject={subject_key.upper()} | Best cosine={best:.3f}")
+    if best < MIN_COSINE:
+        return jsonify({"ok": True, "answer": FALLBACK_TEXT})
 
-sentences = pick_best_sentences_fast(query, chunks, top_k=4)
-if not sentences:
-    return jsonify({"ok": True, "answer": FALLBACK_TEXT})
+    chunks = retrieve_top_chunks(query, subject_key)
+    if not chunks:
+        return jsonify({"ok": True, "answer": FALLBACK_TEXT})
 
-prompt = build_prompt(query, sentences)
+    sentences = pick_best_sentences_fast(query, chunks, top_k=5)
+    if not sentences:
+        return jsonify({"ok": True, "answer": FALLBACK_TEXT})
 
-try:
-    # PASS-1: deterministik & singkat
-    raw_answer = generate(
-        LLM,
-        prompt,
-        max_tokens=int(os.environ.get("MAX_TOKENS", 72)),
-        temperature=float(os.environ.get("TEMP", 0.0)),
-        top_p=1.0,
-        stop=["</final>"]
-    ) or ""
-    raw_answer = raw_answer.strip()
-    log.info(f"[LLM] Raw answer repr (pass1): {repr(raw_answer)}")
-
-    text = re.sub(r"<think\\b[^>]*>.*?</think>", "", raw_answer, flags=re.DOTALL | re.IGNORECASE).strip()
-    text = re.sub(r"</?think\\b[^>]*>", "", text, flags=re.IGNORECASE).strip()
-    m_final = re.search(r"<final>\\s*(.+)$", text, flags=re.IGNORECASE | re.DOTALL)
-    cleaned = (m_final.group(1).strip() if m_final else re.sub(r"<[^>]+>", "", text).strip())
-
-    def _alpha_tokens(s: str) -> List[str]:
-        return re.findall(r"[A-Za-zÀ-ÖØ-öø-ÿ]+", s or "")
-
-    def _is_good(s: str) -> bool:
-        s2 = (s or "").strip()
-        if not s2:
-            return False
-        if s2 in {"...", ".", "..", "…"}:
-            return False
-        toks = _alpha_tokens(s2)
-        # ≥4 token alfabetik dianggap cukup untuk jawaban ringkas
-        if len(toks) >= 4:
-            return True
-        # pengecualian: fakta pendek dengan unit/istilah umum → cukup ≥3 token
-        if any(t.lower() in {"newton", "n", "kg", "m", "s"} for t in toks) and len(toks) >= 3:
-            return True
-        return False
+    prompt = build_prompt(query, sentences)
 
-    # ======= JALANKAN PASS-2 HANYA JIKA PASS-1 BURUK =======
-    if not _is_good(cleaned):
-        prompt_retry = (
-            prompt
-            + "\n\nULANGI DENGAN TAAT FORMAT: "
-              "Tulis satu kalimat faktual tanpa placeholder/ellipsis, "
-              "mulai huruf kapital dan akhiri titik. "
-              "Tulis hanya di dalam <final>...</final>."
-        )
-        raw_answer2 = generate(
+    try:
+        # PASS-1: deterministik & singkat
+        raw_answer = generate(
             LLM,
-            prompt_retry,
-            max_tokens=int(os.environ.get("MAX_TOKENS", 72)),
-            temperature=0.2,
+            prompt,
+            max_tokens=int(os.environ.get("MAX_TOKENS", 64)),
+            temperature=float(os.environ.get("TEMP", 0.2)),
             top_p=1.0,
-            stop=["</final>"],
+            stop=["</final>"]
         ) or ""
-        raw_answer2 = raw_answer2.strip()
-        log.info(f"[LLM] Raw answer repr (pass2): {repr(raw_answer2)}")
-
-        text2 = re.sub(r"<think\b[^>]*>.*?</think>", "", raw_answer2, flags=re.DOTALL | re.IGNORECASE).strip()
-        text2 = re.sub(r"</?think\b[^>]*>", "", text2, flags=re.IGNORECASE).strip()
-        m_final2 = re.search(r"<final>\s*(.+)$", text2, flags=re.IGNORECASE | re.DOTALL)
-        cleaned2 = (m_final2.group(1).strip() if m_final2 else re.sub(r"<[^>]+>", "", text2).strip())
-        if _is_good(cleaned2):
-            cleaned = cleaned2  # hanya pakai PASS-2 jika memang lebih baik
-
-    answer = cleaned
-
-except Exception as e:
-    log.exception(f"[LLM] generate error: {e}")
-    return jsonify({"ok": True, "answer": FALLBACK_TEXT})
-
-# Ambil 1 kalimat pertama saja
-m = re.search(r"(.+?[.!?])(\\s|$)", answer)
-answer = (m.group(1) if m else answer).strip()
-answer = strip_meta_sentence(answer)
+        raw_answer = raw_answer.strip()
+        log.info(f"[LLM] Raw answer repr (pass1): {repr(raw_answer)}")
+
+        text = re.sub(r"<think\\b[^>]*>.*?</think>", "", raw_answer, flags=re.DOTALL | re.IGNORECASE).strip()
+        text = re.sub(r"</?think\\b[^>]*>", "", text, flags=re.IGNORECASE).strip()
+        m_final = re.search(r"<final>\\s*(.+)$", text, flags=re.IGNORECASE | re.DOTALL)
+        cleaned = (m_final.group(1).strip() if m_final else re.sub(r"<[^>]+>", "", text).strip())
+
+        def _alpha_tokens(s: str) -> List[str]:
+            return re.findall(r"[A-Za-zÀ-ÖØ-öø-ÿ]+", s or "")
+
+        def _is_bad(s: str) -> bool:
+            s2 = (s or "").strip()
+            if not s2:
+                return True
+            # nolak placeholder/ellipsis saja
+            if s2 in {"...", ".", "..", "…"}:
+                return True
+            toks = _alpha_tokens(s2)
+            # cukup 4 token alfabetik untuk lolos (lebih toleran utk jawaban singkat)
+            if len(toks) >= 4:
+                return False
+            # pengecualian: fakta pendek dengan unit/istilah umum tetap lolos
+            if any(t.lower() in {"newton","n","kg","m","s"} for t in toks) and len(toks) >= 3:
+                return False
+            return True
 
-# Simpan history
-try:
-    s = db()
-    uid = session.get("user_id")
-    s.add_all([
-        ChatHistory(user_id=uid, subject_key=subject_key, role="user", message=query),
-        ChatHistory(user_id=uid, subject_key=subject_key, role="bot",  message=answer),
-    ])
-    s.commit()
-except Exception as e:
-    log.exception(f"[DB] gagal simpan chat history: {e}")
-finally:
+        if _is_bad(cleaned):
+            prompt_retry = (
+                prompt
+                + "\n\nULANGI DENGAN TAAT FORMAT: "
+                  "Tulis satu kalimat faktual tanpa placeholder/ellipsis, "
+                  "mulai huruf kapital dan akhiri titik. "
+                  "Tulis hanya di dalam <final>...</final>."
+            )
+            raw_answer2 = generate(
+                LLM,
+                prompt_retry,
+                max_tokens=int(os.environ.get("MAX_TOKENS", 64)),
+                temperature=0.2,
+                top_p=1.0,
+                stop=["</final>"]
+            ) or ""
+            raw_answer2 = raw_answer2.strip()
+            log.info(f"[LLM] Raw answer repr (pass2): {repr(raw_answer2)}")
+
+            text2 = re.sub(r"<think\b[^>]*>.*?</think>", "", raw_answer2, flags=re.DOTALL | re.IGNORECASE).strip()
+            text2 = re.sub(r"</?think\b[^>]*>", "", text2, flags=re.IGNORECASE).strip()
+            m_final2 = re.search(r"<final>\s*(.+)$", text2, flags=re.IGNORECASE | re.DOTALL)
+            cleaned2 = (m_final2.group(1).strip() if m_final2 else re.sub(r"<[^>]+>", "", text2).strip())
+            cleaned = cleaned2 or cleaned
+
+        answer = cleaned
+                
+    except Exception as e:
+        log.exception(f"[LLM] generate error: {e}")
+        return jsonify({"ok": True, "answer": FALLBACK_TEXT})
+
+    # Ambil 1 kalimat pertama saja
+    m = re.search(r"(.+?[.!?])(\\s|$)", answer)
+    answer = (m.group(1) if m else answer).strip()
+    answer = strip_meta_sentence(answer)
+
+    # Simpan history
     try:
-        s.close()
-    except Exception:
-        pass
-
-if not answer or len(answer) < 2:
-    answer = FALLBACK_TEXT
-
-if ENABLE_PROFILING:
-    log.info({
-        "latency_total": time.perf_counter() - t0,
-        "subject": subject_key,
-        "faiss_best": best,
-    })
-
-return jsonify({"ok": True, "answer": answer})
-
-```
+        s = db()
+        uid = session.get("user_id")
+        s.add_all([
+            ChatHistory(user_id=uid, subject_key=subject_key, role="user", message=query),
+            ChatHistory(user_id=uid, subject_key=subject_key, role="bot",  message=answer),
+        ])
+        s.commit()
+    except Exception as e:
+        log.exception(f"[DB] gagal simpan chat history: {e}")
+    finally:
+        try:
+            s.close()
+        except Exception:
+            pass
+
+    if not answer or len(answer) < 2:
+        answer = FALLBACK_TEXT
+
+    if ENABLE_PROFILING:
+        log.info({
+            "latency_total": time.perf_counter() - t0,
+            "subject": subject_key,
+            "faiss_best": best,
+        })
+
+    return jsonify({"ok": True, "answer": answer})
 
 # ===== Admin =====
-
 @app.route("/admin")
 @admin_required
 def admin_dashboard():
-s = db()
-try:
-total_users  = s.query(func.count([User.id](http://user.id/))).scalar() or 0
-total_active = s.query(func.count([User.id](http://user.id/))).filter(User.is_active.is_(True)).scalar() or 0
-total_admins = s.query(func.count([User.id](http://user.id/))).filter(User.is_admin.is_(True)).scalar() or 0
-total_msgs   = s.query(func.count([ChatHistory.id](http://chathistory.id/))).scalar() or 0
-finally:
-s.close()
-return render_template("admin_dashboard.html", total_users=total_users, total_active=total_active, total_admins=total_admins, total_msgs=total_msgs)
+    s = db()
+    try:
+        total_users  = s.query(func.count(User.id)).scalar() or 0
+        total_active = s.query(func.count(User.id)).filter(User.is_active.is_(True)).scalar() or 0
+        total_admins = s.query(func.count(User.id)).filter(User.is_admin.is_(True)).scalar() or 0
+        total_msgs   = s.query(func.count(ChatHistory.id)).scalar() or 0
+    finally:
+        s.close()
+    return render_template("admin_dashboard.html", total_users=total_users, total_active=total_active, total_admins=total_admins, total_msgs=total_msgs)
 
 @app.route("/admin/users")
 @admin_required
 def admin_users():
-q = (request.args.get("q") or "").strip().lower()
-page = max(int(request.args.get("page", 1)), 1)
-per_page = min(max(int(request.args.get("per_page", 20)), 5), 100)
-s = db()
-try:
-base = s.query(User)
-if q:
-base = base.filter(or_(func.lower(User.username).like(f"%{q}%"), func.lower(User.email).like(f"%{q}%")))
-total = base.count()
-users = base.order_by(User.id.asc()).offset((page - 1) * per_page).limit(per_page).all()
-user_ids = [[u.id](http://u.id/) for u in users] or [-1]
-counts = dict(s.query(ChatHistory.user_id, func.count([ChatHistory.id](http://chathistory.id/))).filter(ChatHistory.user_id.in_(user_ids)).group_by(ChatHistory.user_id).all())
-finally:
-s.close()
-return render_template("admin_users.html", users=users, counts=counts, q=q, page=page, per_page=per_page, total=total)
+    q = (request.args.get("q") or "").strip().lower()
+    page = max(int(request.args.get("page", 1)), 1)
+    per_page = min(max(int(request.args.get("per_page", 20)), 5), 100)
+    s = db()
+    try:
+        base = s.query(User)
+        if q:
+            base = base.filter(or_(func.lower(User.username).like(f"%{q}%"), func.lower(User.email).like(f"%{q}%")))
+        total = base.count()
+        users = base.order_by(User.id.asc()).offset((page - 1) * per_page).limit(per_page).all()
+        user_ids = [u.id for u in users] or [-1]
+        counts = dict(s.query(ChatHistory.user_id, func.count(ChatHistory.id)).filter(ChatHistory.user_id.in_(user_ids)).group_by(ChatHistory.user_id).all())
+    finally:
+        s.close()
+    return render_template("admin_users.html", users=users, counts=counts, q=q, page=page, per_page=per_page, total=total)
 
 @app.route("/admin/history")
 @admin_required
 def admin_history():
-q        = (request.args.get("q") or "").strip().lower()
-username = (request.args.get("username") or "").strip().lower()
-subject  = (request.args.get("subject") or "").strip().lower()
-role     = (request.args.get("role") or "").strip().lower()
-page = max(int(request.args.get("page", 1)), 1)
-per_page = min(max(int(request.args.get("per_page", 30)), 5), 200)
-s = db()
-try:
-base = (s.query(ChatHistory, User).join(User, [User.id](http://user.id/) == ChatHistory.user_id))
-if q:
-base = base.filter(func.lower(ChatHistory.message).like(f"%{q}%"))
-if username:
-base = base.filter(or_(func.lower(User.username) == username, func.lower(User.email) == username))
-if subject:
-base = base.filter(func.lower(ChatHistory.subject_key) == subject)
-if role in ("user", "bot"):
-base = base.filter(ChatHistory.role == role)
-total = base.count()
-rows = base.order_by(ChatHistory.id.desc()).offset((page - 1) * per_page).limit(per_page).all()
-finally:
-s.close()
-items = [{
-"id": [r.ChatHistory.id](http://r.chathistory.id/),
-"username": r.User.username,
-"email": r.User.email,
-"subject": r.ChatHistory.subject_key,
-"role": r.ChatHistory.role,
-"message": r.ChatHistory.message,
-"timestamp": r.ChatHistory.timestamp,
-} for r in rows]
-return render_template("admin_history.html", items=items, subjects=SUBJECTS, q=q, username=username, subject=subject, role=role, page=page, per_page=per_page, total=total)
-
-def *is_last_admin(s: Session) -> bool:
-return (s.query(func.count([User.id](http://user.id/))).filter(User.is_admin.is*(True)).scalar() or 0) <= 1
-
-@app.route("/admin/users/int:user_id/delete", methods=["POST"])
+    q        = (request.args.get("q") or "").strip().lower()
+    username = (request.args.get("username") or "").strip().lower()
+    subject  = (request.args.get("subject") or "").strip().lower()
+    role     = (request.args.get("role") or "").strip().lower()
+    page = max(int(request.args.get("page", 1)), 1)
+    per_page = min(max(int(request.args.get("per_page", 30)), 5), 200)
+    s = db()
+    try:
+        base = (s.query(ChatHistory, User).join(User, User.id == ChatHistory.user_id))
+        if q:
+            base = base.filter(func.lower(ChatHistory.message).like(f"%{q}%"))
+        if username:
+            base = base.filter(or_(func.lower(User.username) == username, func.lower(User.email) == username))
+        if subject:
+            base = base.filter(func.lower(ChatHistory.subject_key) == subject)
+        if role in ("user", "bot"):
+            base = base.filter(ChatHistory.role == role)
+        total = base.count()
+        rows = base.order_by(ChatHistory.id.desc()).offset((page - 1) * per_page).limit(per_page).all()
+    finally:
+        s.close()
+    items = [{
+        "id": r.ChatHistory.id,
+        "username": r.User.username,
+        "email": r.User.email,
+        "subject": r.ChatHistory.subject_key,
+        "role": r.ChatHistory.role,
+        "message": r.ChatHistory.message,
+        "timestamp": r.ChatHistory.timestamp,
+    } for r in rows]
+    return render_template("admin_history.html", items=items, subjects=SUBJECTS, q=q, username=username, subject=subject, role=role, page=page, per_page=per_page, total=total)
+
+
+def _is_last_admin(s: Session) -> bool:
+    return (s.query(func.count(User.id)).filter(User.is_admin.is_(True)).scalar() or 0) <= 1
+
+@app.route("/admin/users/<int:user_id>/delete", methods=["POST"])
 @admin_required
 def admin_delete_user(user_id: int):
-s = db()
-try:
-me_id = session.get("user_id")
-user = s.query(User).filter_by(id=user_id).first()
-if not user:
-flash("User tidak ditemukan.", "error")
-return redirect(request.referrer or url_for("admin_users"))
-if [user.id](http://user.id/) == me_id:
-flash("Tidak bisa menghapus akun yang sedang login.", "error")
-return redirect(request.referrer or url_for("admin_users"))
-if user.is_admin and _is_last_admin(s):
-flash("Tidak bisa menghapus admin terakhir.", "error")
-return redirect(request.referrer or url_for("admin_users"))
-s.query(ChatHistory).filter(ChatHistory.user_id == [user.id](http://user.id/)).delete(synchronize_session=False)
-s.delete(user); s.commit()
-flash(f"User #{user_id} beserta seluruh riwayatnya telah dihapus.", "success")
-except Exception as e:
-s.rollback(); log.exception(f"[ADMIN] delete user error: {e}")
-flash("Gagal menghapus user.", "error")
-finally:
-s.close()
-return redirect(request.referrer or url_for("admin_users"))
-
-@app.route("/admin/users/int:user_id/history/clear", methods=["POST"])
+    s = db()
+    try:
+        me_id = session.get("user_id")
+        user = s.query(User).filter_by(id=user_id).first()
+        if not user:
+            flash("User tidak ditemukan.", "error")
+            return redirect(request.referrer or url_for("admin_users"))
+        if user.id == me_id:
+            flash("Tidak bisa menghapus akun yang sedang login.", "error")
+            return redirect(request.referrer or url_for("admin_users"))
+        if user.is_admin and _is_last_admin(s):
+            flash("Tidak bisa menghapus admin terakhir.", "error")
+            return redirect(request.referrer or url_for("admin_users"))
+        s.query(ChatHistory).filter(ChatHistory.user_id == user.id).delete(synchronize_session=False)
+        s.delete(user); s.commit()
+        flash(f"User #{user_id} beserta seluruh riwayatnya telah dihapus.", "success")
+    except Exception as e:
+        s.rollback(); log.exception(f"[ADMIN] delete user error: {e}")
+        flash("Gagal menghapus user.", "error")
+    finally:
+        s.close()
+    return redirect(request.referrer or url_for("admin_users"))
+
+@app.route("/admin/users/<int:user_id>/history/clear", methods=["POST"])
 @admin_required
 def admin_clear_user_history(user_id: int):
-s = db()
-try:
-exists = s.query([User.id](http://user.id/)).filter_by(id=user_id).first()
-if not exists:
-flash("User tidak ditemukan.", "error")
-return redirect(request.referrer or url_for("admin_history"))
-deleted = s.query(ChatHistory).filter(ChatHistory.user_id == user_id).delete(synchronize_session=False)
-s.commit()
-flash(f"Riwayat chat user #{user_id} dihapus ({deleted} baris).", "success")
-except Exception as e:
-s.rollback(); log.exception(f"[ADMIN] clear history error: {e}")
-flash("Gagal menghapus riwayat.", "error")
-finally:
-s.close()
-return redirect(request.referrer or url_for("admin_history"))
-
-@app.route("/admin/history/int:chat_id/delete", methods=["POST"])
+    s = db()
+    try:
+        exists = s.query(User.id).filter_by(id=user_id).first()
+        if not exists:
+            flash("User tidak ditemukan.", "error")
+            return redirect(request.referrer or url_for("admin_history"))
+        deleted = s.query(ChatHistory).filter(ChatHistory.user_id == user_id).delete(synchronize_session=False)
+        s.commit()
+        flash(f"Riwayat chat user #{user_id} dihapus ({deleted} baris).", "success")
+    except Exception as e:
+        s.rollback(); log.exception(f"[ADMIN] clear history error: {e}")
+        flash("Gagal menghapus riwayat.", "error")
+    finally:
+        s.close()
+    return redirect(request.referrer or url_for("admin_history"))
+
+@app.route("/admin/history/<int:chat_id>/delete", methods=["POST"])
 @admin_required
 def admin_delete_chat(chat_id: int):
-s = db()
-try:
-row = s.query(ChatHistory).filter_by(id=chat_id).first()
-if not row:
-flash("Baris riwayat tidak ditemukan.", "error")
-return redirect(request.referrer or url_for("admin_history"))
-s.delete(row); s.commit()
-flash(f"Riwayat chat #{chat_id} dihapus.", "success")
-except Exception as e:
-s.rollback(); log.exception(f"[ADMIN] delete chat error: {e}")
-flash("Gagal menghapus riwayat.", "error")
-finally:
-s.close()
-return redirect(request.referrer or url_for("admin_history"))
+    s = db()
+    try:
+        row = s.query(ChatHistory).filter_by(id=chat_id).first()
+        if not row:
+            flash("Baris riwayat tidak ditemukan.", "error")
+            return redirect(request.referrer or url_for("admin_history"))
+        s.delete(row); s.commit()
+        flash(f"Riwayat chat #{chat_id} dihapus.", "success")
+    except Exception as e:
+        s.rollback(); log.exception(f"[ADMIN] delete chat error: {e}")
+        flash("Gagal menghapus riwayat.", "error")
+    finally:
+        s.close()
+    return redirect(request.referrer or url_for("admin_history"))
 
 # ========= ENTRY =========
-
-if **name** == "**main**":
-port = int(os.environ.get("PORT", 7860))
-app.run(host="0.0.0.0", port=port, debug=False)
+if __name__ == "__main__":
+    port = int(os.environ.get("PORT", 7860))
+    app.run(host="0.0.0.0", port=port, debug=False)