Wire up query history: localStorage session persistence + sidebar UI

apps/ai-service/adapters/postgres.py

@@ -20,6 +20,7 @@ class RetrievalTrace:
     citations: tuple[dict[str, Any], ...]
     correlation_id: str | None = None
     otel_trace_id: str | None = None
+    conversation_id: str | None = None
     created_at: datetime | None = None
 
 
@@ -63,6 +64,7 @@ class PostgresTraceRepository:
         citations: tuple[dict[str, Any], ...],
         correlation_id: str | None = None,
         otel_trace_id: str | None = None,
+        conversation_id: str | None = None,
     ) -> str:
         import psycopg
 
@@ -73,13 +75,13 @@ class PostgresTraceRepository:
                 INSERT INTO rag_retrieval_trace (
                     trace_id, query_text, subject_scope, query_intent,
                     decision, reason, resolved_drug_id, citations,
-                    correlation_id, otel_trace_id
-                ) VALUES (%s, %s, %s, %s, %s, %s, %s, %s::jsonb, %s, %s)
+                    correlation_id, otel_trace_id, conversation_id
+                ) VALUES (%s, %s, %s, %s, %s, %s, %s, %s::jsonb, %s, %s, %s)
                 """,
                 (
                     trace_id, query, subject_scope, intent, decision, reason,
                     resolved_drug_id, json.dumps(citations, ensure_ascii=False),
-                    correlation_id, otel_trace_id,
+                    correlation_id, otel_trace_id, conversation_id,
                 ),
             )
         return trace_id
@@ -92,7 +94,7 @@ class PostgresTraceRepository:
                 """
                 SELECT trace_id::text, query_text, subject_scope, query_intent,
                        decision, reason, resolved_drug_id, citations,
-                       correlation_id, otel_trace_id, created_at
+                       correlation_id, otel_trace_id, conversation_id, created_at
                 FROM rag_retrieval_trace WHERE trace_id = %s
                 """,
                 (trace_id,),
@@ -103,9 +105,46 @@ class PostgresTraceRepository:
             trace_id=row[0], query=row[1], subject_scope=row[2], intent=row[3],
             decision=row[4], reason=row[5], resolved_drug_id=row[6],
             citations=tuple(row[7]), correlation_id=row[8], otel_trace_id=row[9],
-            created_at=row[10],
+            conversation_id=row[10], created_at=row[11],
         )
 
+    def list_by_conversation(
+        self, conversation_id: str, limit: int
+    ) -> list[RetrievalTrace]:
+        """Past queries for one session — Feature-List #25 (lịch sử tra
+        cứu), most recent first. Scoped to `conversation_id` on purpose:
+        this system has no auth anywhere (`apps/api-gateway`/`auth-service`
+        are unbuilt — see README), so an unscoped listing would mix every
+        browser's/user's queries together. Citations/answer text are NOT
+        persisted here (only decision/reason/resolved_drug_id) — a history
+        entry is for re-running the same query, not replaying its old
+        answer verbatim.
+        """
+        import psycopg
+
+        with psycopg.connect(self._dsn, connect_timeout=5) as connection:
+            rows = connection.execute(
+                """
+                SELECT trace_id::text, query_text, subject_scope, query_intent,
+                       decision, reason, resolved_drug_id, citations,
+                       correlation_id, otel_trace_id, conversation_id, created_at
+                FROM rag_retrieval_trace
+                WHERE conversation_id = %s
+                ORDER BY created_at DESC
+                LIMIT %s
+                """,
+                (conversation_id, limit),
+            ).fetchall()
+        return [
+            RetrievalTrace(
+                trace_id=row[0], query=row[1], subject_scope=row[2], intent=row[3],
+                decision=row[4], reason=row[5], resolved_drug_id=row[6],
+                citations=tuple(row[7]), correlation_id=row[8], otel_trace_id=row[9],
+                conversation_id=row[10], created_at=row[11],
+            )
+            for row in rows
+        ]
+
     def save_feedback(
         self,
         *,

apps/ai-service/adapters/qdrant.py

@@ -359,6 +359,52 @@ class QdrantRetriever:
             hits.append(SearchHit(_document(payload), 1.0))
         return hits
 
+    def list_sections(self, drug_id: str) -> list[tuple[str, str]]:
+        """Every section this drug has ANY content for — prose or
+        quarantined — as `(section_key, section_display_name)` pairs, in
+        book order (`rag.sections.SECTION_ORDER`). Feature-List #4: the UI
+        needs the real per-drug checklist, not a generic 19-item list, since
+        coverage genuinely varies (confirmed corpus-wide: 7 to 19 sections
+        per drug).
+
+        Deliberately NOT `find_by_drug`'s `chunk_kind == "prose"` filter — a
+        section that exists ONLY as a quarantined table (no prose chunk at
+        all) is still a real section of this monograph; the caller decides
+        how to present a request for it (`find_by_section` already handles
+        the quarantine notice). A projection scroll: only the two payload
+        fields this needs, never `text` — the checklist has no reason to
+        pull every chunk's full content over the wire.
+        """
+        from qdrant_client.models import FieldCondition, Filter, MatchValue
+
+        from rag.sections import SECTION_ORDER
+
+        scroll_filter = Filter(
+            must=[FieldCondition(key="drug_id", match=MatchValue(value=drug_id))]
+        )
+        found: dict[str, str] = {}
+        offset = None
+        while True:
+            points, offset = self._client.scroll(
+                collection_name=self._collection_name,
+                scroll_filter=scroll_filter,
+                limit=256,
+                offset=offset,
+                with_payload=["section_key", "section_display_name"],
+            )
+            for point in points:
+                payload = dict(point.payload or {})
+                key = payload.get("section_key")
+                if key and key not in found:
+                    found[key] = payload.get("section_display_name") or key
+            if offset is None:
+                break
+
+        order = {key: index for index, key in enumerate(SECTION_ORDER)}
+        return sorted(
+            found.items(), key=lambda item: order.get(item[0], len(order))
+        )
+
     def find_by_indication(self, indication_text: str, limit: int) -> list[SearchHit]:
         """Reverse lookup: every drug whose `chi_dinh` text mentions the given
         symptom/indication, keyword-matched. Deterministic, no fabrication

apps/ai-service/bootstrap.py

@@ -137,7 +137,7 @@ def build_runtime(settings: Settings):
     effective_metrics = metrics or NullMetrics()
     configure_telemetry(settings, effective_metrics)
     if settings.embedding_provider == "disabled":
-        return None, None, PostgresTraceRepository(settings.postgres_dsn), metrics
+        return None, None, PostgresTraceRepository(settings.postgres_dsn), metrics, None
     if settings.embedding_provider != "cohere-v4":
         raise ValueError(
             "No production query embedder is configured. Supported values: "
@@ -169,8 +169,13 @@ def build_runtime(settings: Settings):
     # drug identity through `LlmQueryUnderstander` against the same catalog.
     resolver = CatalogDrugResolver(aliases)
     reranker = _build_reranker(settings)
+    # Returned on its own below (Feature-List #4/#23's section-list and
+    # verbatim-section-text endpoints) — both are plain payload-filtered
+    # Qdrant reads with no LLM/generation involved, so they read straight
+    # from this adapter rather than through `RetrievalService`/`RagAgent`.
+    qdrant_retriever = QdrantRetriever(client, settings.qdrant_collection, embedder)
     retrieval = InstrumentedRetrievalService(
-        QdrantRetriever(client, settings.qdrant_collection, embedder),
+        qdrant_retriever,
         QdrantParentStore(client, settings.qdrant_collection),
         EvidencePolicy(minimum_score=settings.evidence_minimum_score),
         section_resolver=section_resolver,
@@ -195,7 +200,7 @@ def build_runtime(settings: Settings):
         # understanding either, so there is no conversational/agent
         # capability to offer. Answer-only (retrieval-verified, no
         # generation) still works through `answers` directly.
-        return answers, None, trace_writer, metrics
+        return answers, None, trace_writer, metrics, qdrant_retriever
     agent = InstrumentedRagAgent(
         understander=InstrumentedQueryUnderstander(
             LlmQueryUnderstander(generator, _catalog_names(aliases), resolver)
@@ -208,4 +213,4 @@ def build_runtime(settings: Settings):
         store=PostgresConversationStore(settings.postgres_dsn),
         metrics=effective_metrics,
     )
-    return answers, agent, trace_writer, metrics
+    return answers, agent, trace_writer, metrics, qdrant_retriever

apps/ai-service/main.py

@@ -28,6 +28,7 @@ def create_app(
     conversational: Any | None = None,
     trace_writer: PostgresTraceRepository | None = None,
     metrics: Any | None = None,
+    section_retriever: Any | None = None,
 ) -> FastAPI:
     configured = settings or get_settings()
     effective_metrics = metrics or NullMetrics()
@@ -37,6 +38,12 @@ def create_app(
     app.state.conversational = conversational
     app.state.trace_writer = trace_writer
     app.state.metrics = metrics
+    # The raw Qdrant retriever, not routed through RagAgent — Feature-List
+    # #4/#23's section-list and verbatim-section-text endpoints are plain
+    # payload-filtered reads with no LLM/generation step, so nothing about
+    # them belongs on the answer/agent path. None whenever embedding is
+    # disabled (no Qdrant client exists at all in that mode).
+    app.state.section_retriever = section_retriever
 
     @app.middleware("http")
     async def correlate_and_trace(request: Request, call_next):
@@ -128,11 +135,14 @@ def _route_label(path: str) -> str:
 
 
 _settings = get_settings()
-_answer_service, _conversational, _trace_writer, _metrics = build_runtime(_settings)
+_answer_service, _conversational, _trace_writer, _metrics, _section_retriever = (
+    build_runtime(_settings)
+)
 app = create_app(
     settings=_settings,
     answer_service=_answer_service,
     conversational=_conversational,
     trace_writer=_trace_writer,
     metrics=_metrics,
+    section_retriever=_section_retriever,
 )

apps/ai-service/migrations/005_rag_trace_conversation.sql

@@ -0,0 +1,6 @@
+ALTER TABLE rag_retrieval_trace
+    ADD COLUMN IF NOT EXISTS conversation_id varchar(128);
+
+CREATE INDEX IF NOT EXISTS rag_retrieval_trace_conversation_idx
+    ON rag_retrieval_trace (conversation_id, created_at DESC)
+    WHERE conversation_id IS NOT NULL;

apps/ai-service/rag/agent.py

@@ -28,6 +28,7 @@ from .clinical import ConditionRelation, MedicationCandidateAssessment
 from .models import EvidenceDecision, RetrievalResult
 from .policy import looks_non_human
 from .service import RetrievalService
+from .text import normalize_name
 from .understanding import QueryFrame, QueryUnderstander
 
 logger = logging.getLogger(__name__)
@@ -53,6 +54,27 @@ MAX_LLM_CALLS_PER_TURN = 8
 # turns on the same conversation, force a hard stop instead of asking again.
 MAX_CONSECUTIVE_CLARIFY = 4
 
+# Feature-List #18/#19: "out_of_scope" used to cover two different things
+# with one identical message that named neither — a question about data
+# the formulary genuinely never contains for ANY drug (price, vendor,
+# brand availability), and a question with nothing to do with drugs at
+# all. Found live 2026-08-14 asking both "Paracetamol giá bao nhiêu?" and
+# "Thời tiết Hà Nội hôm nay?" and getting the same vague "nằm ngoài phần
+# chuyên luận... có thể thuộc phụ lục chưa được đưa vào" — which reads as
+# "maybe added later" for data that will never be in a drug formulary.
+# Deliberately a keyword heuristic, same trade-off as policy.py's
+# looks_non_human: cheap, auditable, no model call on the abstain path.
+_OUT_OF_SCOPE_DATA_PHRASES = (
+    "gia bao nhieu", "gia ca", "gia tien", "bao nhieu tien",
+    "mua o dau", "ban o dau", "nha thuoc nao ban",
+    "thuong hieu nao", "hang san xuat", "nha san xuat",
+)
+
+
+def _looks_like_missing_data_question(query: str) -> bool:
+    normalized = normalize_name(query)
+    return any(phrase in normalized for phrase in _OUT_OF_SCOPE_DATA_PHRASES)
+
 
 class ConversationStore(Protocol):
     """Durable, cross-worker alternative to the in-process history dict —
@@ -404,11 +426,23 @@ class RagAgent:
                 turn_type=tt)
 
         if tt == "out_of_scope":
+            if _looks_like_missing_data_question(turn):
+                return AgentReply(
+                    "abstain", "out_of_scope",
+                    answer="Dược thư Quốc gia Việt Nam KHÔNG chứa giá bán, nơi bán "
+                           "hay thương hiệu/nhà sản xuất cụ thể của thuốc — đây "
+                           "không phải nội dung sách này tra cứu (sách chỉ có chỉ "
+                           "định, liều dùng, chống chỉ định, tương tác thuốc và các "
+                           "mục chuyên môn khác). Vui lòng tra các nguồn khác cho "
+                           "thông tin này.",
+                    turn_type=tt)
             return AgentReply(
                 "abstain", "out_of_scope",
-                answer="Nội dung này nằm ngoài phần chuyên luận thuốc của Dược thư "
-                       "(có thể thuộc phần hướng dẫn chung/phụ lục chưa được đưa vào). "
-                       "Tôi chưa có dữ liệu để trả lời chính xác.",
+                answer="Câu hỏi này nằm ngoài phạm vi hỗ trợ của hệ thống. Hệ "
+                       "thống chỉ tra cứu thông tin thuốc theo Dược thư Quốc gia "
+                       "Việt Nam 2018 — chỉ định, liều dùng, chống chỉ định, tác "
+                       "dụng phụ, tương tác thuốc và các mục chuyên môn khác của "
+                       "một thuốc cụ thể.",
                 turn_type=tt)
 
         if not frame.drugs:

apps/ai-service/rag/answer.py

@@ -30,7 +30,7 @@ from .routing import QueryRoutingService
 # be different prompts (or a different judge) to be independent evidence —
 # see this function's own reasoning above.
 
-_QUICK_REPLY_MAX_ITEMS = 18  # one per monograph section (see rag/sections.py SECTION_ORDER)
+_QUICK_REPLY_MAX_ITEMS = 19  # one per monograph section (see rag/sections.py SECTION_ORDER)
 _QUICK_REPLY_MAX_CHARS = 40
 logger = logging.getLogger(__name__)
 
@@ -368,6 +368,39 @@ def _presentation_for_sources(source_ids: tuple[str, ...]) -> tuple[str, str]:
     return "Trả lời", "fact_list"
 
 
+# Feature-List #14: a condition/symptom -> drug reverse lookup
+# (`list_mode=True`, `RagAgent._condition_to_drug`) states which drugs the
+# formulary's `chi_dinh` sections name for this indication — a factual
+# lookup, never a treatment ranking (see
+# `[[feedback_no_recommendation_gate]]`) — but rendered as a bare drug list
+# it reads exactly like a recommendation. Fixed, non-generated block, same
+# guarantee as `DISCLAIMER` above: the model never sees or writes this text,
+# so it cannot reword, shorten, or drop it. Always the first block; `kind`
+# matches `_plan_answer`'s forced `needs_warning=True` for `list_mode`, so
+# the UI renders it with the same visual separation as any other warning
+# block, not a plain bullet.
+_LIST_MODE_NOTICE_BLOCK = AnswerBlock(
+    title="Đọc cho đúng",
+    kind="warning",
+    claims=(
+        AnswerClaim(
+            text=(
+                "Đây là kết quả TRA CỨU các thuốc mà Dược thư Quốc gia Việt "
+                "Nam ghi nhận chỉ định cho triệu chứng/bệnh này, KHÔNG PHẢI "
+                "khuyến nghị điều trị hay chỉ định lâm sàng cho một người "
+                "bệnh cụ thể."
+            ),
+        ),
+    ),
+)
+
+
+def _with_list_mode_notice(
+    blocks: tuple[AnswerBlock, ...], list_mode: bool
+) -> tuple[AnswerBlock, ...]:
+    return (_LIST_MODE_NOTICE_BLOCK, *blocks) if list_mode else blocks
+
+
 def _build_blocks(
     claims: tuple[tuple[str, tuple[int, ...]], ...],
     indexed: list[tuple[str, Citation]],
@@ -437,7 +470,10 @@ def _plan_answer(query: str, result: RetrievalResult, list_mode: bool) -> Answer
         layout=layout,
         reasoning_mode="synthesis" if multi_source else "direct_lookup",
         show_heading=multi_source or verbosity == "detailed",
-        needs_warning=any(section in _WARNING_SECTIONS for section in sections),
+        # `list_mode` always carries `_LIST_MODE_NOTICE_BLOCK` (see below) —
+        # this is what gives that block its actual warning presentation in
+        # the UI, not just a plain untitled bullet.
+        needs_warning=list_mode or any(section in _WARNING_SECTIONS for section in sections),
     )
 
 
@@ -677,7 +713,7 @@ class GroundedAnswerService:
                     (text, (index,))
                     for index, text in enumerate(evidence_texts, start=1)
                 )
-                blocks = _build_blocks(claims, indexed)
+                blocks = _with_list_mode_notice(_build_blocks(claims, indexed), list_mode)
                 return GroundedAnswer(
                     result,
                     "\n".join(text for text, _ in claims),
@@ -724,7 +760,7 @@ class GroundedAnswerService:
             if 1 <= index <= len(indexed)
         ))
         citations = tuple(indexed[index - 1][1] for index in cited_indices)
-        blocks = _build_blocks(outcome.claims, indexed)
+        blocks = _with_list_mode_notice(_build_blocks(outcome.claims, indexed), list_mode)
         clean_answer = "\n".join(text for text, _ in outcome.claims)
         self._metrics.increment(metric_names.GENERATION_SERVED)
         return GroundedAnswer(

apps/ai-service/rag/ports.py

@@ -76,3 +76,12 @@ class SectionRetriever(Protocol):
 
 class ParentStore(Protocol):
     def get(self, parent_id: str) -> ParentDocument | None: ...
+
+
+class SectionListRetriever(Protocol):
+    """The per-drug section checklist Feature-List #4 needs, cheap because
+    `drug_id`/`section_key` are already-indexed Qdrant payload fields — no
+    new indexing. Separate from `SectionRetriever` (interface segregation):
+    this returns labels only, never chunk text."""
+
+    def list_sections(self, drug_id: str) -> list[tuple[str, str]]: ...

apps/ai-service/rag/sections.py

@@ -147,12 +147,27 @@ SECTION_PHRASES: dict[str, tuple[str, ...]] = {
 }
 
 
-# Book order of monograph sections (Hướng dẫn sử dụng, printed page 39). Used to
-# present a whole-drug overview when the query names the drug but no attribute —
-# typing "PARACETAMOL" should return the monograph, never a "specify an
-# attribute" dead-end.
+# Book order of monograph sections, verified 2026-08-14 against the actual
+# PDF (physical page 38 = printed page 39, "HƯỚNG DẪN SỬ DỤNG DƯỢC THƯ QUỐC
+# GIA VIỆT NAM"), not assumed from an earlier reading of this constant. The
+# guide numbers 19 items; item 1, "Tên chuyên luận thuốc", is the monograph's
+# own title/heading, not a content section with a `section_key` — items 2-19
+# are exactly these 18 keys, in exactly this order. Confirms this tuple was
+# already complete and correctly ordered for the book's own stated template.
+#
+# `ten_thuong_mai` (trade name) is real, present in the corpus (492/684
+# drugs) but is NOT one of the guide's 19 numbered items — the book's own
+# template never promises it, so there is no book-verified position to place
+# it at. Inserted right after `ten_chung_quoc_te` (generic/INN name) as the
+# most natural adjacency (same convention `understanding.py`'s `SECTION_KEYS`
+# already uses) — a judgment call, not a sourced fact, unlike the 18 above.
+#
+# Used to present a whole-drug overview when the query names the drug but no
+# attribute — typing "PARACETAMOL" should return the monograph, never a
+# "specify an attribute" dead-end.
 SECTION_ORDER: tuple[str, ...] = (
     "ten_chung_quoc_te",
+    "ten_thuong_mai",
     "ma_atc",
     "loai_thuoc",
     "dang_thuoc_va_ham_luong",
@@ -208,3 +223,37 @@ class SectionResolver:
             if f" {normalized_phrase} " in padded:
                 return SectionMatch(section_key, phrase)
         return None
+
+    def resolve_all(self, query: str) -> tuple[SectionMatch, ...]:
+        """Every distinct section a question genuinely names, not just the
+        first. Same longest-first order as `resolve()`, and the same
+        span-claiming rule: once a phrase's occurrence is accepted, any
+        shorter phrase whose only occurrence falls inside that already-
+        claimed span is a substring of it, not a second section — e.g.
+        "chỉ định" inside "chống chỉ định của X" must NOT count as a second,
+        separate mention of `chi_dinh`. A phrase counts only when it has an
+        occurrence that does not overlap any span already claimed by a
+        longer, earlier-accepted phrase. Returns `()` for no match and
+        exactly one item when the question names only one section — this is
+        a superset of `resolve()`, not a replacement for it.
+        """
+        normalized_query = normalize_name(query)
+        if not normalized_query:
+            return ()
+        padded = f" {normalized_query} "
+        claimed: list[tuple[int, int]] = []
+        seen_sections: set[str] = set()
+        matches: list[SectionMatch] = []
+        for normalized_phrase, section_key, phrase in self._index:
+            needle = f" {normalized_phrase} "
+            idx = padded.find(needle)
+            if idx == -1:
+                continue
+            span = (idx, idx + len(needle))
+            if any(span[0] < c_end and c_start < span[1] for c_start, c_end in claimed):
+                continue
+            claimed.append(span)
+            if section_key not in seen_sections:
+                seen_sections.add(section_key)
+                matches.append(SectionMatch(section_key, phrase))
+        return tuple(matches)

apps/ai-service/rag/understanding.py

@@ -118,6 +118,31 @@ SECTION_KEY_HINTS: dict[str, str] = {
     "thong_tin_quy_che": "thông tin quy chế/pháp lý",
 }
 
+# Short, chip-sized Vietnamese section names — SECTION_KEY_HINTS above is
+# full-sentence disambiguation text for the model, well over
+# _QUICK_REPLY_MAX_CHARS, so it cannot double as a quick_reply label.
+_SECTION_SHORT_LABEL: dict[str, str] = {
+    "ten_chung_quoc_te": "Tên chung quốc tế",
+    "ten_thuong_mai": "Tên thương mại",
+    "ma_atc": "Mã ATC",
+    "loai_thuoc": "Loại thuốc",
+    "dang_thuoc_va_ham_luong": "Dạng thuốc và hàm lượng",
+    "duoc_ly_va_co_che_tac_dung": "Dược lý, cơ chế tác dụng",
+    "chi_dinh": "Chỉ định",
+    "chong_chi_dinh": "Chống chỉ định",
+    "than_trong": "Thận trọng",
+    "thoi_ky_mang_thai": "Thời kỳ mang thai",
+    "thoi_ky_cho_con_bu": "Thời kỳ cho con bú",
+    "tac_dung_khong_mong_muon": "Tác dụng không mong muốn",
+    "huong_dan_xu_tri_adr": "Xử trí ADR",
+    "lieu_luong_va_cach_dung": "Liều lượng và cách dùng",
+    "tuong_tac_thuoc": "Tương tác thuốc",
+    "qua_lieu_va_xu_tri": "Quá liều và xử trí",
+    "do_on_dinh_va_bao_quan": "Độ ổn định, bảo quản",
+    "tuong_ky": "Tương kỵ",
+    "thong_tin_quy_che": "Thông tin quy chế",
+}
+
 # What kind of turn this is — the router branches on it. Deliberately explicit so a
 # symptom lookup is never silently treated as a failed drug lookup, and a two-drug
 # interaction never collapses to an "ambiguous drug" abstain.
@@ -294,7 +319,7 @@ _ALLOWED_ROUTES = {
     "uong", "tiem_tinh_mach", "tiem_bap", "tiem_duoi_da",
     "dat_truc_trang", "boi_ngoai_da", "nho_mat", "nho_mui", "khac",
 }
-_QUICK_REPLY_MAX_ITEMS = 18  # one per monograph section (see rag/sections.py SECTION_ORDER)
+_QUICK_REPLY_MAX_ITEMS = 19  # one per monograph section (see rag/sections.py SECTION_ORDER)
 _QUICK_REPLY_MAX_CHARS = 40
 
 _SYSTEM = """Bạn là bộ HIỂU CÂU HỎI cho một chatbot tra cứu Dược thư Quốc gia Việt Nam.
@@ -577,6 +602,7 @@ class LlmQueryUnderstander:
             resolved_section_key=(section_match.section_key if section_match else None),
             resolved_section_phrase=(section_match.phrase if section_match else None),
         )
+        frame = _apply_multi_section_clarify(frame, turn)
         return _merge_with_prior_frame(frame, prior_frame)
 
     @staticmethod
@@ -856,6 +882,51 @@ def _apply_named_drug_cues(
     return frame
 
 
+def _apply_multi_section_clarify(frame: QueryFrame, turn: str) -> QueryFrame:
+    """A turn naming two-or-more distinct monograph sections for one drug
+    ("chỉ định và chống chỉ định của X") cannot be served by narrowing
+    `attribute` to a single value: both the model's own JSON output and
+    `_apply_named_drug_cues` above only ever produce one `attribute`, so
+    retrieval silently fetches evidence for whichever section wins while the
+    question handed to generation still promises both. The completeness check
+    then correctly reports a real, quote-backed gap against the one section
+    actually retrieved, generation retries with the same mismatched scope,
+    and the turn fails closed as a confusing `incomplete_answer` abstain —
+    found live 2026-08-14, reproduced 2/2 on "Chỉ định và chống chỉ định của
+    Aspirin là gì?". Answering every named section at once is a larger,
+    separate change (multi-attribute retrieval); asking which one first is
+    the safe interim behavior, using the generic `needs_clarify`+
+    `clarify_reason` clarify path `RagAgent` already has (checked ahead of
+    the narrower `attribute is None` -> `missing_attribute` branch, and the
+    only one of the two that forwards `quick_replies`).
+
+    Scoped to turns already read as a single named drug's own attribute(s)
+    — `_apply_named_drug_cues` runs first, so by this point `turn_type` is
+    already "drug_attribute"/"drug_overview" for exactly the cases this
+    bug affects; interaction/condition/dosing turns are untouched.
+    """
+    if frame.turn_type not in ("drug_attribute", "drug_overview") or not frame.drugs:
+        return frame
+    matches = _SECTION_RESOLVER.resolve_all(turn)
+    distinct_sections = tuple(dict.fromkeys(match.section_key for match in matches))
+    if len(distinct_sections) < 2:
+        return frame
+    options = tuple(
+        _SECTION_SHORT_LABEL.get(key, key) for key in distinct_sections
+    )[:_QUICK_REPLY_MAX_ITEMS]
+    return replace(
+        frame,
+        turn_type="drug_attribute",
+        attribute=None,
+        needs_clarify=True,
+        clarify_reason=(
+            "Câu hỏi nêu nhiều mục cùng lúc — anh/chị muốn xem mục nào trước?"
+        ),
+        quick_replies=options,
+        system_error=None,
+    )
+
+
 _KNOWN_FACT_LABELS: tuple[tuple[str, str], ...] = (
     ("population", "Đối tượng"),
     ("age_text", "Tuổi"),

apps/ai-service/routers/rag.py

@@ -10,6 +10,7 @@ from rag.answer import DISCLAIMER, GroundedAnswerService
 from rag.metrics import DECISION, TRACE_WRITE_FAILED, Metrics, NullMetrics
 from rag.models import QueryIntent, SubjectScope
 from rag.policy import resolve_subject_scope
+from rag.ports import SectionListRetriever, SectionRetriever
 from rag.telemetry import (
     annotate_current_span,
     current_correlation_id,
@@ -24,6 +25,8 @@ class TraceWriter(Protocol):
 
     def save_feedback(self, **fields: Any) -> str: ...
 
+    def list_by_conversation(self, conversation_id: str, limit: int) -> list[Any]: ...
+
 
 class RagQueryRequest(BaseModel):
     query: str = Field(min_length=1, max_length=4000)
@@ -145,6 +148,15 @@ def _metrics(request: Request) -> Metrics:
     return getattr(request.app.state, "metrics", None) or NullMetrics()
 
 
+def _section_retriever(request: Request) -> SectionListRetriever:
+    retriever = getattr(request.app.state, "section_retriever", None)
+    if retriever is None:
+        raise HTTPException(
+            status_code=503, detail="Section retrieval backend is not configured"
+        )
+    return retriever
+
+
 router = APIRouter(prefix="/v1/rag", tags=["rag"])
 
 
@@ -168,6 +180,57 @@ def save_feedback(
     return RagFeedbackResponse(feedback_id=feedback_id)
 
 
+class HistoryItem(BaseModel):
+    trace_id: str
+    query: str
+    decision: str
+    reason: str
+    resolved_drug_id: str | None = None
+    created_at: str
+
+
+class HistoryResponse(BaseModel):
+    items: list[HistoryItem]
+
+
+_HISTORY_LIMIT = 50
+
+
+@router.get("/history", response_model=HistoryResponse)
+def list_history(
+    conversation_id: str,
+    traces: Annotated[TraceWriter, Depends(_trace_writer)],
+) -> HistoryResponse:
+    """Feature-List #25: past queries for one session, most recent first, so
+    the UI can list them and let the user click one to re-run — not to
+    replay the old answer verbatim, which isn't persisted (see
+    `PostgresTraceRepository.list_by_conversation`'s docstring). Scoped
+    strictly to `conversation_id`: this system has no auth anywhere, so an
+    unscoped listing would leak every session's queries to every caller.
+    An empty/missing `conversation_id` returns no rows rather than every
+    trace in the database."""
+    trimmed = conversation_id.strip()
+    if not trimmed:
+        return HistoryResponse(items=[])
+    try:
+        rows = traces.list_by_conversation(trimmed, limit=_HISTORY_LIMIT)
+    except Exception as exc:
+        raise HTTPException(status_code=503, detail="trace_store_unavailable") from exc
+    return HistoryResponse(
+        items=[
+            HistoryItem(
+                trace_id=row.trace_id,
+                query=row.query,
+                decision=row.decision,
+                reason=row.reason,
+                resolved_drug_id=row.resolved_drug_id,
+                created_at=row.created_at.isoformat() if row.created_at else "",
+            )
+            for row in rows
+        ]
+    )
+
+
 class SuggestResponse(BaseModel):
     suggestions: list[str]
 
@@ -181,6 +244,98 @@ def suggest_drugs(q: str, request: Request) -> SuggestResponse:
     return SuggestResponse(suggestions=agent.complete(q.strip()))
 
 
+class SectionListItem(BaseModel):
+    section_key: str
+    section_title: str
+
+
+class SectionListResponse(BaseModel):
+    sections: list[SectionListItem]
+
+
+@router.get("/sections", response_model=SectionListResponse)
+def list_drug_sections(
+    drug_id: str,
+    retriever: Annotated[SectionListRetriever, Depends(_section_retriever)],
+) -> SectionListResponse:
+    """Feature-List #4: the real per-drug section checklist, not a generic
+    fixed list — coverage genuinely varies (measured corpus-wide: 7 to 19
+    sections per drug). No LLM/generation involved, a plain indexed-payload
+    read, so an unknown or unresolved `drug_id` returns an empty list rather
+    than a 404 — the caller (UI attribute picker) already knows which
+    `drug_id` it resolved before calling this."""
+    sections = retriever.list_sections(drug_id.strip())
+    return SectionListResponse(
+        sections=[
+            SectionListItem(section_key=key, section_title=title)
+            for key, title in sections
+        ]
+    )
+
+
+class SectionTextPart(BaseModel):
+    part_index: int | None = None
+    text: str
+    # True for a quarantined table/formula chunk — `text` is then the
+    # chunker's own descriptor sentence ("bảng, trang N..."), not the
+    # table's content; never a paraphrase, per the quarantine contract
+    # (docs-legacy/adr/0006). The caller must not present this the same way
+    # as a real verbatim excerpt.
+    is_quarantined: bool
+    printed_page_start: int | None = None
+    printed_page_end: int | None = None
+    physical_page: int | None = None
+
+
+class SectionTextResponse(BaseModel):
+    drug_id: str
+    section_key: str
+    section_title: str | None = None
+    parts: list[SectionTextPart]
+
+
+def _section_text_part(hit) -> SectionTextPart:
+    doc = hit.document
+    ref = doc.source_refs[0] if doc.source_refs else None
+    printed_range = ref.printed_page_range if ref else None
+    printed_start = printed_range[0] if printed_range else (ref.printed_page if ref else None)
+    printed_end = printed_range[1] if printed_range else (ref.printed_page if ref else None)
+    return SectionTextPart(
+        part_index=doc.part_index,
+        text=doc.text,
+        is_quarantined=doc.requires_visual_check,
+        printed_page_start=printed_start,
+        printed_page_end=printed_end,
+        physical_page=ref.physical_page if ref else None,
+    )
+
+
+@router.get("/section-text", response_model=SectionTextResponse)
+def get_section_text(
+    drug_id: str,
+    section_key: str,
+    retriever: Annotated[SectionRetriever, Depends(_section_retriever)],
+) -> SectionTextResponse:
+    """Feature-List #23: the verbatim source of one section, on demand — no
+    LLM/generation/entailment involved, so there is nothing to verify;
+    `evidence_text` on a `/query` citation is the same underlying text but
+    only for chunks the model actually cited, never a guaranteed whole
+    section. `find_by_section` already returns every part in book order
+    (never truncated), which this just joins into an ordered part list —
+    curation of WHICH sections a UI offers this for (e.g. a "6 mục an
+    toàn" default) is a client concern; this endpoint is generic to any
+    real `section_key`, same as `find_by_section` itself."""
+    hits = retriever.find_by_section(drug_id.strip(), section_key.strip())
+    parts = [_section_text_part(hit) for hit in hits]
+    section_title = hits[0].document.section_title if hits else None
+    return SectionTextResponse(
+        drug_id=drug_id,
+        section_key=section_key,
+        section_title=section_title,
+        parts=parts,
+    )
+
+
 def _map_citations(items) -> list[CitationResponse]:
     return [
         CitationResponse(
@@ -343,6 +498,7 @@ def query_rag(
                 citations=tuple(item.model_dump() for item in citations),
                 correlation_id=correlation_id,
                 otel_trace_id=otel_trace_id,
+                conversation_id=payload.conversation_id,
             )
     except Exception:
         metrics.increment(TRACE_WRITE_FAILED)

apps/ai-service/tests/test_agent.py

@@ -99,6 +99,27 @@ def test_out_of_scope_turn_type_abstains():
     assert reply.reason == "out_of_scope"
 
 
+def test_out_of_scope_price_question_states_the_book_does_not_have_it():
+    """Regression: found live 2026-08-14 that a price question and a
+    genuinely off-topic question ("thời tiết Hà Nội hôm nay?") got the exact
+    same vague message, which never actually says Dược thư has no pricing
+    data at all — it read as "maybe in an appendix not digitized yet"."""
+    agent = _agent(QueryFrame(turn_type="out_of_scope"))
+    reply = agent.handle("Paracetamol giá bao nhiêu tiền một hộp?")
+    assert reply.decision == "abstain"
+    assert reply.reason == "out_of_scope"
+    assert "không chứa" in reply.answer.lower()
+
+
+def test_out_of_scope_offtopic_question_states_supported_scope():
+    agent = _agent(QueryFrame(turn_type="out_of_scope"))
+    reply = agent.handle("Thời tiết Hà Nội hôm nay thế nào?")
+    assert reply.decision == "abstain"
+    assert reply.reason == "out_of_scope"
+    assert "giá bán" not in reply.answer
+    assert "Dược thư" in reply.answer
+
+
 def test_veterinary_phrase_abstains_even_if_the_model_missed_it():
     # The model returned an ordinary-looking frame; the keyword backstop
     # (`rag.policy.looks_non_human`, the same one F-02 wired server-side)

apps/ai-service/tests/test_api.py

@@ -1,13 +1,23 @@
+from datetime import datetime, timezone
+
 from fastapi.testclient import TestClient
 
 from adapters.prometheus import PrometheusMetrics
-from adapters.postgres import FeedbackTraceNotFound
+from adapters.postgres import FeedbackTraceNotFound, RetrievalTrace
 from config import Settings
 from main import create_app
 from rag.agent import AgentReply
 from rag.answer import DISCLAIMER, Citation, GroundedAnswerService
 from rag.metrics import TRACE_WRITE_FAILED, InMemoryMetrics
-from rag.models import EvidenceDecision, QueryIntent, RetrievalResult, SubjectScope
+from rag.models import (
+    EvidenceDecision,
+    QueryIntent,
+    RetrievalDocument,
+    RetrievalResult,
+    SearchHit,
+    SourceRef,
+    SubjectScope,
+)
 
 
 class FixedRouting:
@@ -31,6 +41,9 @@ class MemoryTraceWriter:
         self.feedback.append(fields)
         return "feedback-1"
 
+    def list_by_conversation(self, conversation_id, limit):
+        return []
+
 
 def test_feedback_is_linked_to_the_answer_trace():
     traces = MemoryTraceWriter()
@@ -67,6 +80,76 @@ def test_feedback_rejects_an_unpersisted_trace():
     assert response.json() == {"detail": "trace_not_found"}
 
 
+class FakeHistoryTraceWriter(MemoryTraceWriter):
+    def __init__(self, by_conversation):
+        super().__init__()
+        self._by_conversation = by_conversation
+        self.calls = []
+
+    def list_by_conversation(self, conversation_id, limit):
+        self.calls.append((conversation_id, limit))
+        return self._by_conversation.get(conversation_id, [])
+
+
+def test_history_lists_past_queries_for_a_conversation_most_recent_first():
+    when = datetime(2026, 8, 14, 10, 0, tzinfo=timezone.utc)
+    traces = FakeHistoryTraceWriter({
+        "case-1": [
+            RetrievalTrace(
+                trace_id="t2", query="Chống chỉ định metformin?",
+                subject_scope="human", intent="fact_lookup",
+                decision="answerable", reason="grounded_evidence_available",
+                resolved_drug_id="metformin", citations=(),
+                conversation_id="case-1", created_at=when,
+            ),
+            RetrievalTrace(
+                trace_id="t1", query="Chỉ định metformin?",
+                subject_scope="human", intent="fact_lookup",
+                decision="answerable", reason="grounded_evidence_available",
+                resolved_drug_id="metformin", citations=(),
+                conversation_id="case-1", created_at=when,
+            ),
+        ],
+    })
+    app = create_app(settings=Settings(), trace_writer=traces)
+
+    response = TestClient(app).get("/v1/rag/history", params={"conversation_id": "case-1"})
+
+    assert response.status_code == 200
+    body = response.json()
+    assert [item["query"] for item in body["items"]] == [
+        "Chống chỉ định metformin?", "Chỉ định metformin?",
+    ]
+    assert body["items"][0]["trace_id"] == "t2"
+    assert body["items"][0]["decision"] == "answerable"
+    assert traces.calls == [("case-1", 50)]
+
+
+def test_history_with_empty_conversation_id_returns_no_rows_and_does_not_query():
+    """An empty/missing id must not silently fall through to an unscoped
+    listing — there is no auth anywhere in this system to make that safe."""
+    traces = FakeHistoryTraceWriter({})
+    app = create_app(settings=Settings(), trace_writer=traces)
+
+    response = TestClient(app).get("/v1/rag/history", params={"conversation_id": "  "})
+
+    assert response.status_code == 200
+    assert response.json() == {"items": []}
+    assert traces.calls == []
+
+
+def test_history_for_unknown_conversation_is_empty_not_an_error():
+    traces = FakeHistoryTraceWriter({})
+    app = create_app(settings=Settings(), trace_writer=traces)
+
+    response = TestClient(app).get(
+        "/v1/rag/history", params={"conversation_id": "never-seen"}
+    )
+
+    assert response.status_code == 200
+    assert response.json() == {"items": []}
+
+
 def test_health_and_fail_closed_rag_response_are_traced():
     traces = MemoryTraceWriter()
     app = create_app(
@@ -248,6 +331,137 @@ def test_suggest_with_no_agent_configured_returns_empty():
     assert response.json() == {"suggestions": []}
 
 
+class FakeSectionRetriever:
+    def __init__(self, sections=None, section_texts=None):
+        self._sections = sections or {}
+        self._section_texts = section_texts or {}
+        self.calls = []
+
+    def list_sections(self, drug_id):
+        self.calls.append(drug_id)
+        return self._sections.get(drug_id, [])
+
+    def find_by_section(self, drug_id, section_key):
+        self.calls.append((drug_id, section_key))
+        return self._section_texts.get((drug_id, section_key), [])
+
+
+def test_list_sections_returns_the_real_per_drug_checklist():
+    retriever = FakeSectionRetriever({
+        "metformin": [
+            ("chi_dinh", "Chỉ định"),
+            ("chong_chi_dinh", "Chống chỉ định"),
+        ],
+    })
+    app = create_app(
+        settings=Settings(), trace_writer=MemoryTraceWriter(), section_retriever=retriever
+    )
+    response = TestClient(app).get("/v1/rag/sections", params={"drug_id": "metformin"})
+
+    assert response.status_code == 200
+    assert response.json() == {
+        "sections": [
+            {"section_key": "chi_dinh", "section_title": "Chỉ định"},
+            {"section_key": "chong_chi_dinh", "section_title": "Chống chỉ định"},
+        ]
+    }
+    assert retriever.calls == ["metformin"]
+
+
+def test_list_sections_with_no_retriever_configured_is_503_not_an_empty_list():
+    """Distinct from `/suggest`'s empty-list fallback on purpose: an empty
+    list here would read as "this drug has zero sections", which is false —
+    it means the backend isn't configured at all."""
+    app = create_app(settings=Settings(), trace_writer=MemoryTraceWriter())
+    response = TestClient(app).get("/v1/rag/sections", params={"drug_id": "metformin"})
+
+    assert response.status_code == 503
+
+
+def _hit(text, *, part_index=0, printed_page=200, physical_page=195, quarantined=False):
+    return SearchHit(
+        document=RetrievalDocument(
+            doc_id=f"metformin__chong_chi_dinh__{part_index}",
+            drug_id="metformin",
+            kind="block_descriptor" if quarantined else "prose",
+            text=text,
+            section_key="chong_chi_dinh",
+            section_title="Chống chỉ định",
+            source_refs=(SourceRef(
+                physical_page=physical_page, precision="exact", printed_page=printed_page,
+            ),),
+            part_index=part_index,
+            requires_visual_check=quarantined,
+        ),
+        score=1.0,
+    )
+
+
+def test_section_text_joins_parts_in_order_with_page_provenance():
+    retriever = FakeSectionRetriever(section_texts={
+        ("metformin", "chong_chi_dinh"): [
+            _hit("Phần một.", part_index=0, printed_page=200),
+            _hit("Phần hai.", part_index=1, printed_page=201),
+        ],
+    })
+    app = create_app(
+        settings=Settings(), trace_writer=MemoryTraceWriter(), section_retriever=retriever
+    )
+    response = TestClient(app).get(
+        "/v1/rag/section-text", params={"drug_id": "metformin", "section_key": "chong_chi_dinh"}
+    )
+
+    assert response.status_code == 200
+    body = response.json()
+    assert body["section_title"] == "Chống chỉ định"
+    assert [p["text"] for p in body["parts"]] == ["Phần một.", "Phần hai."]
+    assert body["parts"][0]["printed_page_start"] == 200
+    assert body["parts"][0]["is_quarantined"] is False
+    assert retriever.calls == [("metformin", "chong_chi_dinh")]
+
+
+def test_section_text_flags_quarantined_parts_instead_of_treating_them_as_verbatim():
+    retriever = FakeSectionRetriever(section_texts={
+        ("metformin", "chong_chi_dinh"): [
+            _hit(
+                "METFORMIN — Chống chỉ định — bảng, trang 200. Nội dung chỉ "
+                "tra cứu được trên ảnh trang gốc.",
+                quarantined=True,
+            ),
+        ],
+    })
+    app = create_app(
+        settings=Settings(), trace_writer=MemoryTraceWriter(), section_retriever=retriever
+    )
+    response = TestClient(app).get(
+        "/v1/rag/section-text", params={"drug_id": "metformin", "section_key": "chong_chi_dinh"}
+    )
+
+    assert response.json()["parts"][0]["is_quarantined"] is True
+
+
+def test_section_text_with_unknown_drug_returns_empty_parts_not_an_error():
+    retriever = FakeSectionRetriever()
+    app = create_app(
+        settings=Settings(), trace_writer=MemoryTraceWriter(), section_retriever=retriever
+    )
+    response = TestClient(app).get(
+        "/v1/rag/section-text", params={"drug_id": "khong_ton_tai", "section_key": "chi_dinh"}
+    )
+
+    assert response.status_code == 200
+    assert response.json()["parts"] == []
+
+
+def test_section_text_with_no_retriever_configured_is_503():
+    app = create_app(settings=Settings(), trace_writer=MemoryTraceWriter())
+    response = TestClient(app).get(
+        "/v1/rag/section-text", params={"drug_id": "metformin", "section_key": "chi_dinh"}
+    )
+
+    assert response.status_code == 503
+
+
 # --- F-09: trace persistence is fail-open ------------------------------------
 
 

apps/ai-service/tests/test_citation_and_intro.py

@@ -227,6 +227,62 @@ def test_list_mode_skips_the_sufficiency_clarify():
     assert g.generated is True
 
 
+def test_list_mode_prepends_a_lookup_not_recommendation_notice_block():
+    """Feature-List #14: a condition/symptom -> drug list reads like a
+    treatment recommendation unless it is explicitly labelled as a lookup.
+    The notice must be a fixed block the model never writes (so it can't be
+    reworded or dropped), first in `blocks`, and carry the plan's
+    `needs_warning` flag so the UI actually renders it set apart."""
+    result = _answerable(_evidence(0, 100), _evidence(1, 200))
+    gen = _Generator(
+        {"claims": [
+            {"text": "Đoạn bằng chứng 0", "citations": [1]},
+            {"text": "Đoạn bằng chứng 1", "citations": [2]},
+         ], "evidence_sufficient": True, "clarifying_question": None},
+    )
+    service = GroundedAnswerService(_Routing(result), gen)
+
+    g = service.answer_from_result("thuốc gì trị sốt", result, list_mode=True)
+
+    assert g.blocks[0].title == "Đọc cho đúng"
+    assert g.blocks[0].kind == "warning"
+    assert "TRA CỨU" in g.blocks[0].claims[0].text
+    assert "KHÔNG PHẢI" in g.blocks[0].claims[0].text
+    assert g.plan is not None and g.plan.needs_warning is True
+    # The generated claims still follow, untouched, after the fixed notice.
+    assert len(g.blocks) == 2
+
+
+def test_single_drug_answer_has_no_list_mode_notice():
+    """The notice is specific to `list_mode` (multi-drug reverse lookup) —
+    an ordinary single-drug attribute answer must not carry it."""
+    evidence = Evidence(
+        evidence_id="a__chong_chi_dinh__0",
+        matched_doc_id="a__chong_chi_dinh__0",
+        kind="prose",
+        text="Chống chỉ định của thuốc A.",
+        score=1.0,
+        source_refs=(SourceRef(physical_page=100, precision="exact", printed_page=101),),
+        hydrated_from_parent=False,
+        requires_visual_check=False,
+        drug_id="a",
+        drug_name="A",
+        section_key="chong_chi_dinh",
+    )
+    result = _answerable(evidence)
+    gen = _Generator({
+        "claims": [{"text": "Không dùng thuốc A khi mẫn cảm.", "citations": [1]}],
+        "evidence_sufficient": True,
+        "clarifying_question": None,
+        "quick_replies": [],
+    })
+    service = GroundedAnswerService(_Routing(result), gen)
+
+    g = service.answer_from_result("Chống chỉ định của A?", result, list_mode=False)
+
+    assert all(block.title != "Đọc cho đúng" for block in g.blocks)
+
+
 def test_list_mode_rejects_a_generated_drug_outside_candidate_set():
     evidence = Evidence(
         evidence_id="a__chi_dinh__0",

apps/ai-service/tests/test_live_datastores.py

@@ -24,6 +24,9 @@ CONVERSATION_MIGRATION = (
 FEEDBACK_MIGRATION = (
     Path(__file__).resolve().parents[1] / "migrations/004_rag_answer_feedback.sql"
 )
+HISTORY_MIGRATION = (
+    Path(__file__).resolve().parents[1] / "migrations/005_rag_trace_conversation.sql"
+)
 
 
 class _PlumbingEmbedder:
@@ -117,6 +120,7 @@ def test_real_postgres_migration_insert_and_read_back():
         "postgresql://duoc_thu:duoc_thu@localhost:5432/duoc_thu"
     )
     repository.migrate(MIGRATION)
+    repository.migrate(HISTORY_MIGRATION)
     trace_id = repository.save(
         query="Liều abacavir?",
         subject_scope="human",
@@ -145,6 +149,7 @@ def test_real_postgres_feedback_upserts_against_a_persisted_trace():
     )
     repository.migrate(MIGRATION)
     repository.migrate(FEEDBACK_MIGRATION)
+    repository.migrate(HISTORY_MIGRATION)
     trace_id = repository.save(
         query="Gút dùng thuốc gì?",
         subject_scope="human",
@@ -171,6 +176,43 @@ def test_real_postgres_feedback_upserts_against_a_persisted_trace():
     assert second == first
 
 
+def test_real_postgres_history_lists_by_conversation_most_recent_first():
+    """Feature-List #25 against a real Postgres: proves the migration,
+    save()'s new conversation_id column, and list_by_conversation's
+    filter+order all actually work together, not just against fakes."""
+    from adapters.postgres import PostgresTraceRepository
+
+    repository = PostgresTraceRepository(
+        "postgresql://duoc_thu:duoc_thu@localhost:5432/duoc_thu"
+    )
+    repository.migrate(MIGRATION)
+    repository.migrate(HISTORY_MIGRATION)
+    conversation_id = f"history-integration-{uuid.uuid4()}"
+
+    first_id = repository.save(
+        query="Chỉ định của metformin?", subject_scope="human", intent="fact_lookup",
+        decision="answerable", reason="grounded_evidence_available",
+        resolved_drug_id="metformin", citations=(), conversation_id=conversation_id,
+    )
+    second_id = repository.save(
+        query="Chống chỉ định của metformin?", subject_scope="human", intent="fact_lookup",
+        decision="answerable", reason="grounded_evidence_available",
+        resolved_drug_id="metformin", citations=(), conversation_id=conversation_id,
+    )
+    # A different conversation must never leak into this one's history.
+    repository.save(
+        query="Liều aspirin?", subject_scope="human", intent="fact_lookup",
+        decision="answerable", reason="grounded_evidence_available",
+        resolved_drug_id="aspirin", citations=(),
+        conversation_id=f"other-{uuid.uuid4()}",
+    )
+
+    rows = repository.list_by_conversation(conversation_id, limit=10)
+
+    assert [row.trace_id for row in rows] == [second_id, first_id]
+    assert all(row.conversation_id == conversation_id for row in rows)
+
+
 def test_real_postgres_conversation_store_round_trip():
     """F-08's durable conversation history against a real Postgres, not a
     fake — proves `append`/`recent` actually persist and window correctly,
@@ -264,6 +306,7 @@ def test_real_rag_agent_end_to_end_through_the_http_api():
         "postgresql://duoc_thu:duoc_thu@localhost:5432/duoc_thu"
     )
     traces.migrate(MIGRATION)
+    traces.migrate(HISTORY_MIGRATION)
     try:
         qdrant.create_collection(
             collection_name=collection,
@@ -363,6 +406,7 @@ def test_api_round_trip_uses_qdrant_and_persists_postgres_trace():
         "postgresql://duoc_thu:duoc_thu@localhost:5432/duoc_thu"
     )
     traces.migrate(MIGRATION)
+    traces.migrate(HISTORY_MIGRATION)
     try:
         qdrant.create_collection(
             collection_name=collection,

apps/ai-service/tests/test_qdrant_adapter.py

@@ -243,3 +243,79 @@ def test_search_lexical_excludes_non_matching_sections():
     hits = retriever.search_lexical("loét dạ dày", "aspirin", limit=5)
 
     assert hits == []
+
+
+def _section_meta_payload(
+    drug_id: str, section_key: str, display_name: str, part_index: int = 0
+) -> dict:
+    return {
+        "chunk_id": f"{drug_id}__{section_key}__{part_index}", "drug_id": drug_id,
+        "section_key": section_key, "section_display_name": display_name,
+        "part_index": part_index, "chunk_kind": "prose", "text": "nội dung",
+    }
+
+
+def test_list_sections_returns_book_order_not_scroll_order():
+    client = _FakeScrollClient([
+        _section_meta_payload("aspirin", "qua_lieu_va_xu_tri", "Quá liều và xử trí"),
+        _section_meta_payload("aspirin", "chi_dinh", "Chỉ định"),
+        _section_meta_payload("aspirin", "ten_chung_quoc_te", "Tên chung quốc tế"),
+    ])
+    retriever = QdrantRetriever(client, "duocthu_v1", embedder=None)
+
+    sections = retriever.list_sections("aspirin")
+
+    assert [key for key, _ in sections] == [
+        "ten_chung_quoc_te", "chi_dinh", "qua_lieu_va_xu_tri",
+    ]
+    assert dict(sections)["chi_dinh"] == "Chỉ định"
+
+
+def test_list_sections_dedupes_multi_part_sections():
+    client = _FakeScrollClient([
+        _section_meta_payload("aspirin", "chi_dinh", "Chỉ định", part_index=0),
+        _section_meta_payload("aspirin", "chi_dinh", "Chỉ định", part_index=1),
+        _section_meta_payload("aspirin", "chi_dinh", "Chỉ định", part_index=2),
+    ])
+    retriever = QdrantRetriever(client, "duocthu_v1", embedder=None)
+
+    sections = retriever.list_sections("aspirin")
+
+    assert sections == [("chi_dinh", "Chỉ định")]
+
+
+def test_list_sections_includes_quarantined_only_sections():
+    """A section with no prose chunk at all (only a block_descriptor) is
+    still a real section of the monograph — must not be filtered out the
+    way `find_by_drug`'s prose-only overview deliberately is."""
+    client = _FakeScrollClient([
+        {
+            "chunk_id": "aspirin__lieu_luong_va_cach_dung__block__p1_t0",
+            "drug_id": "aspirin", "section_key": "lieu_luong_va_cach_dung",
+            "section_display_name": "Liều lượng và cách dùng",
+            "chunk_kind": "block_descriptor", "text": "bảng, trang 1.",
+        },
+    ])
+    retriever = QdrantRetriever(client, "duocthu_v1", embedder=None)
+
+    sections = retriever.list_sections("aspirin")
+
+    assert sections == [("lieu_luong_va_cach_dung", "Liều lượng và cách dùng")]
+
+
+def test_list_sections_places_ten_thuong_mai_after_generic_name():
+    """`ten_thuong_mai` isn't one of the book's own 19 numbered fields
+    (verified against the actual PDF, printed page 39) — placed right after
+    the generic name as the most natural adjacency."""
+    client = _FakeScrollClient([
+        _section_meta_payload("aspirin", "chi_dinh", "Chỉ định"),
+        _section_meta_payload("aspirin", "ten_thuong_mai", "Tên thương mại"),
+        _section_meta_payload("aspirin", "ten_chung_quoc_te", "Tên chung quốc tế"),
+    ])
+    retriever = QdrantRetriever(client, "duocthu_v1", embedder=None)
+
+    sections = retriever.list_sections("aspirin")
+
+    assert [key for key, _ in sections] == [
+        "ten_chung_quoc_te", "ten_thuong_mai", "chi_dinh",
+    ]

apps/ai-service/tests/test_section_routing.py

@@ -177,6 +177,49 @@ class TestSectionResolver:
         )
 
 
+class TestSectionResolverResolveAll:
+    """`resolve_all` — the fix for `abstain/incomplete_answer` reproduced
+    live 2026-08-14 on "Chỉ định và chống chỉ định của Aspirin là gì?":
+    `resolve()` silently picked one section, retrieval only fetched that
+    one, and the still-broad question failed the completeness check against
+    it. These pin that a genuine two-section question reports both, while a
+    substring collision (the exact case `resolve()` itself guards against)
+    still reports only one.
+    """
+
+    def test_two_genuinely_named_sections_both_reported(self) -> None:
+        resolver = SectionResolver()
+        matches = resolver.resolve_all(
+            "Chỉ định và chống chỉ định của Aspirin là gì?"
+        )
+        assert {m.section_key for m in matches} == {"chi_dinh", "chong_chi_dinh"}
+
+    def test_substring_collision_is_not_double_counted(self) -> None:
+        """"chỉ định" is a literal substring of "chống chỉ định" — this must
+        stay a single match, exactly like `resolve()` already guarantees."""
+        resolver = SectionResolver()
+        matches = resolver.resolve_all("Chống chỉ định của aspirin là gì?")
+        assert [m.section_key for m in matches] == ["chong_chi_dinh"]
+
+    def test_three_sections_named_at_once(self) -> None:
+        resolver = SectionResolver()
+        matches = resolver.resolve_all(
+            "Liều dùng, chống chỉ định và tương tác thuốc của Metformin?"
+        )
+        assert {m.section_key for m in matches} == {
+            "lieu_luong_va_cach_dung", "chong_chi_dinh", "tuong_tac_thuoc",
+        }
+
+    def test_single_section_question_still_returns_one(self) -> None:
+        resolver = SectionResolver()
+        matches = resolver.resolve_all("Liều dùng metformin?")
+        assert [m.section_key for m in matches] == ["lieu_luong_va_cach_dung"]
+
+    def test_unrecognised_question_returns_empty(self) -> None:
+        assert SectionResolver().resolve_all("thuốc này giá bao nhiêu") == ()
+        assert SectionResolver().resolve_all("") == ()
+
+
 class TestSectionRouting:
     def test_named_section_bypasses_similarity_entirely(self) -> None:
         retriever = SectionAwareRetriever(ALL_DOCS)

apps/ai-service/tests/test_understanding.py

@@ -110,6 +110,58 @@ def test_golden_named_drug_section_overrides_a_misclassified_relation_frame():
     assert frame.needs_clarify is False
 
 
+def test_two_sections_named_at_once_clarifies_instead_of_silently_narrowing():
+    """Regression for `abstain/incomplete_answer` reproduced live 2026-08-14
+    on "Chỉ định và chống chỉ định của Aspirin là gì?": the turn used to
+    silently collapse to whichever one section `_apply_named_drug_cues`
+    picked (chống chỉ định, being the longer phrase), so retrieval only
+    fetched that section's evidence while the question handed to generation
+    still promised both — a real, quote-backed completeness gap the
+    generator could never close. Must now clarify instead."""
+    understander = LlmQueryUnderstander(_FixedLlm({
+        "turn_type": "drug_attribute",
+        "drugs": ["paracetamol_acetaminophen"],
+        "unknown_drugs": [],
+        "attribute": "chong_chi_dinh",
+        "population": None,
+        "weight_kg": None,
+        "age_text": None,
+        "indication": None,
+        "needs_clarify": False,
+        "clarify_reason": None,
+    }), CATALOG, RESOLVER)
+
+    frame = understander.understand(
+        "Chỉ định và chống chỉ định của Paracetamol là gì?"
+    )
+
+    assert frame.turn_type == "drug_attribute"
+    assert frame.drugs == ("paracetamol_acetaminophen",)
+    assert frame.attribute is None
+    assert frame.needs_clarify is True
+    assert set(frame.quick_replies) == {"Chỉ định", "Chống chỉ định"}
+
+
+def test_single_section_named_is_unaffected_by_the_multi_section_clarify():
+    understander = LlmQueryUnderstander(_FixedLlm({
+        "turn_type": "drug_attribute",
+        "drugs": ["paracetamol_acetaminophen"],
+        "unknown_drugs": [],
+        "attribute": "chong_chi_dinh",
+        "population": None,
+        "weight_kg": None,
+        "age_text": None,
+        "indication": None,
+        "needs_clarify": False,
+        "clarify_reason": None,
+    }), CATALOG, RESOLVER)
+
+    frame = understander.understand("Chống chỉ định của Paracetamol là gì?")
+
+    assert frame.attribute == "chong_chi_dinh"
+    assert frame.needs_clarify is False
+
+
 def test_exact_candidate_does_not_repeat_the_catalog_wide_fuzzy_scan():
     resolver = _FakeResolver({"metformin": "metformin"})
     understander = LlmQueryUnderstander(_FixedLlm({
@@ -244,11 +296,11 @@ def test_quick_replies_are_parsed_when_the_model_offers_them():
 
 
 def test_quick_replies_are_dynamic_but_bounded_before_becoming_ui_chips():
-    # 19 distinct valid entries (after "  Người   lớn  " / "người lớn" dedup
-    # and the non-string 12 are dropped) so the 18-item cap — one per
+    # 20 distinct valid entries (after "  Người   lớn  " / "người lớn" dedup
+    # and the non-string 12 are dropped) so the 19-item cap — one per
     # monograph section, see rag/sections.py SECTION_ORDER — still trims
     # the last one, not just the old 4-item cap.
-    extra = [f"Lựa chọn {i}" for i in range(6, 20)]
+    extra = [f"Lựa chọn {i}" for i in range(6, 21)]
     understander = LlmQueryUnderstander(_FixedLlm({
         "turn_type": "dosing_calc", "drugs": ["paracetamol_acetaminophen"],
         "unknown_drugs": [], "attribute": None, "population": None,
@@ -263,11 +315,11 @@ def test_quick_replies_are_dynamic_but_bounded_before_becoming_ui_chips():
 
     frame = understander.understand("liều paracetamol")
 
-    assert len(frame.quick_replies) == 18
+    assert len(frame.quick_replies) == 19
     assert frame.quick_replies[:5] == (
         "Người lớn", "Trẻ em", "Phụ nữ có thai", "Người cao tuổi", "Lựa chọn thứ năm"
     )
-    assert "Lựa chọn 19" not in frame.quick_replies
+    assert "Lựa chọn 20" not in frame.quick_replies
 
 
 def test_string_false_does_not_turn_into_a_clarification():

apps/web/app/_components/Sidebar.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import React, { useState } from "react";
+import React, { useEffect, useState } from "react";
 import {
   Plus,
   MessageSquare,
@@ -11,6 +11,7 @@ import {
   ChevronLeft,
   ChevronRight,
   ShieldCheck,
+  History,
   Zap,
 } from "lucide-react";
 import { cn } from "@duoc-thu/ui";
@@ -59,6 +60,12 @@ const QUICK_PROMPTS = [
   },
 ];
 
+interface HistoryItem {
+  trace_id: string;
+  query: string;
+  decision: string;
+}
+
 export function Sidebar({
   currentSessionId,
   sessions,
@@ -70,6 +77,32 @@ export function Sidebar({
 }: SidebarProps) {
   const [searchTerm, setSearchTerm] = useState("");
   const [isCollapsed, setIsCollapsed] = useState(false);
+  const [historyItems, setHistoryItems] = useState<HistoryItem[]>([]);
+
+  // Feature-List #25: past queries FOR THIS SESSION, most recent first —
+  // click one to re-run it (via `onQuickQuery`, same path the hardcoded
+  // quick-prompts below already use). Deliberately re-fetched whenever the
+  // active session changes, not lifted to page.tsx: `Composer.tsx`'s own
+  // autocomplete fetch already establishes the pattern of a component
+  // owning its own small read, rather than everything prop-drilled down.
+  useEffect(() => {
+    if (!currentSessionId) {
+      setHistoryItems([]);
+      return;
+    }
+    let cancelled = false;
+    fetch(`/api/history?conversation_id=${encodeURIComponent(currentSessionId)}`)
+      .then((res) => (res.ok ? res.json() : { items: [] }))
+      .then((data) => {
+        if (!cancelled) setHistoryItems(Array.isArray(data?.items) ? data.items : []);
+      })
+      .catch(() => {
+        if (!cancelled) setHistoryItems([]);
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [currentSessionId]);
 
   const filteredSessions = sessions.filter((s) =>
     s.title.toLowerCase().includes(searchTerm.toLowerCase())
@@ -204,6 +237,33 @@ export function Sidebar({
           })
         )}
 
+        {/* Query History — real past questions for this session (Feature-
+            List #25), click to re-run the same question. Empty when the
+            session has no persisted queries yet (a brand-new session, or
+            history backend unavailable) — the quick-prompt templates below
+            still work as a starting point either way. */}
+        {historyItems.length > 0 && (
+          <div className="pt-4 px-2 border-t border-border-subtle mt-4">
+            <div className="pb-2 text-[0.68rem] font-bold tracking-wider text-txt-muted uppercase flex items-center gap-1">
+              <History className="w-3 h-3 text-accent-primary" />
+              <span>Lịch sử câu hỏi</span>
+            </div>
+            <div className="space-y-1.5">
+              {historyItems.map((item) => (
+                <button
+                  key={item.trace_id}
+                  onClick={() => onQuickQuery(item.query)}
+                  title={item.query}
+                  className="w-full text-left p-2 rounded-xl bg-surface-elevated hover:bg-surface-hover border border-border-subtle text-txt-secondary hover:text-txt-primary text-[0.72rem] leading-snug transition-all flex items-center justify-between group"
+                >
+                  <span className="truncate pr-1">{item.query}</span>
+                  <History className="w-3 h-3 text-accent-primary shrink-0 opacity-70 group-hover:opacity-100" />
+                </button>
+              ))}
+            </div>
+          </div>
+        )}
+
         {/* Quick Prompts Section */}
         <div className="pt-4 px-2 border-t border-border-subtle mt-4">
           <div className="pb-2 text-[0.68rem] font-bold tracking-wider text-txt-muted uppercase flex items-center gap-1">

apps/web/app/api/history/route.ts

@@ -0,0 +1,38 @@
+import { NextResponse } from "next/server";
+
+export const runtime = "nodejs";
+
+const API_GATEWAY_URL =
+  process.env.API_GATEWAY_URL ?? process.env.AI_SERVICE_URL ?? "http://localhost:8000";
+
+export async function GET(request: Request) {
+  const { searchParams } = new URL(request.url);
+  const conversationId = searchParams.get("conversation_id")?.trim() || "";
+
+  if (!conversationId) {
+    return NextResponse.json({ items: [] });
+  }
+
+  try {
+    const targetUrl = API_GATEWAY_URL.includes("/v1/rag")
+      ? `${API_GATEWAY_URL.replace(/\/query$/, "/history")}?conversation_id=${encodeURIComponent(conversationId)}`
+      : `${API_GATEWAY_URL}/v1/rag/history?conversation_id=${encodeURIComponent(conversationId)}`;
+
+    const upstream = await fetch(targetUrl, {
+      method: "GET",
+      headers: {
+        "X-Client-Version": "1.0.0",
+      },
+      cache: "no-store",
+    });
+
+    if (!upstream.ok) {
+      return NextResponse.json({ items: [] });
+    }
+
+    const data = await upstream.json();
+    return NextResponse.json(data);
+  } catch {
+    return NextResponse.json({ items: [] });
+  }
+}

apps/web/app/page.tsx

@@ -12,6 +12,28 @@ function createSessionId() {
   return `session-${crypto.randomUUID()}`;
 }
 
+// Feature-List #25: the session id is the key `/v1/rag/history` scopes its
+// listing by, so persisting it is a prerequisite for history surviving a
+// refresh at all — not just a UX nicety. Chat MESSAGE CONTENT is
+// deliberately NOT persisted here (server never stores generated answer
+// text/blocks either, only decision/reason metadata — see
+// `PostgresTraceRepository.list_by_conversation`'s docstring): a resumed
+// session's transcript starts empty, matching the spec's own "re-run the
+// query" wording rather than "replay the old answer".
+const SESSIONS_STORAGE_KEY = "dt_sessions";
+const CURRENT_SESSION_STORAGE_KEY = "dt_current_session_id";
+
+function loadStoredSessions(): ChatSession[] | null {
+  try {
+    const raw = localStorage.getItem(SESSIONS_STORAGE_KEY);
+    if (!raw) return null;
+    const parsed = JSON.parse(raw);
+    return Array.isArray(parsed) && parsed.length > 0 ? parsed : null;
+  } catch {
+    return null;
+  }
+}
+
 export default function ChatPage() {
   const [sessions, setSessions] = useState<ChatSession[]>([]);
   const [currentSessionId, setCurrentSessionId] = useState<string>("");
@@ -19,12 +41,49 @@ export default function ChatPage() {
   const [queryOverride, setQueryOverride] = useState<{ text: string; token: number } | null>(null);
 
   useEffect(() => {
+    const stored = loadStoredSessions();
+    if (stored) {
+      const storedCurrent = (() => {
+        try {
+          return localStorage.getItem(CURRENT_SESSION_STORAGE_KEY);
+        } catch {
+          return null;
+        }
+      })();
+      setSessions(stored);
+      setMessagesBySession(Object.fromEntries(stored.map((s) => [s.id, []])));
+      setCurrentSessionId(stored.find((s) => s.id === storedCurrent)?.id ?? stored[0].id);
+      return;
+    }
     const id = createSessionId();
     setSessions([{ id, title: "Phiên tra cứu mới", updatedAt: new Date().toISOString() }]);
     setMessagesBySession({ [id]: [] });
     setCurrentSessionId(id);
   }, []);
 
+  // Persist whenever the session list / active session changes — covers
+  // new/deleted sessions and switching between them. Guarded on non-empty
+  // so the pre-mount-effect empty state never overwrites a real stored
+  // list with `[]`.
+  useEffect(() => {
+    if (sessions.length === 0) return;
+    try {
+      localStorage.setItem(SESSIONS_STORAGE_KEY, JSON.stringify(sessions));
+    } catch {
+      // Storage full or unavailable (e.g. private browsing) — the session
+      // list simply won't survive a refresh this time.
+    }
+  }, [sessions]);
+
+  useEffect(() => {
+    if (!currentSessionId) return;
+    try {
+      localStorage.setItem(CURRENT_SESSION_STORAGE_KEY, currentSessionId);
+    } catch {
+      // ignore — same fallback as above
+    }
+  }, [currentSessionId]);
+
   // Citation & Evidence Panel State
   const [citations, setCitations] = useState<Citation[]>([]);
   const [activeCitationIndex, setActiveCitationIndex] = useState<number | null>(null);

coordination/CLAUDE_CLAIM_2026-08-14.md

@@ -0,0 +1,64 @@
+# Claude ownership claim — 2026-08-14
+
+Working from `Feature-List-AI-Duoc-thu-V1.md` (new file, owner-added this
+session): a live 17-query audit against production found 5/26 features fully
+passing, plus one reproducible bug (`incomplete_answer` on any two-section
+question, e.g. "Chỉ định và chống chỉ định của Aspirin"). Full audit + plan
+were reviewed and approved by the owner before starting
+(`C:\Users\vuxba\.claude\plans\snug-sparking-goose.md`, not in-repo).
+
+Checked `WORK_SPLIT_2026-08-10.md` (Codex owns `rag/**`) against the more
+recent per-session claims: `CLAUDE_CLAIM_2026-08-11.md` and
+`CLAUDE_CLAIM_2026-08-12.md` both show Claude editing `rag/answer.py` /
+`rag/agent.py` directly after that split, each time with an explicit claim
+and an explicit "not touching" list rather than treating the 08-10 split as
+still absolute. Following that same practice here.
+
+`git log` confirms **production is on current HEAD** (`4f867aa`, "Deploy to
+production" succeeded 2026-08-14T04:59:27Z) — three same-day/previous-day
+commits (`3c6262e`, `623fd62`, `f662835`) already fixed adjacent bugs; none
+of them touch the scope below.
+
+## Work split across 3 branches/PRs this session
+
+- **PR1 (this claim, branch `agent/fix-clarify-and-safety-messaging`)**: the
+  `incomplete_answer` bug fix + 3 small response-text/UI fixes.
+- **PR2 (next)**: two new read-only endpoints — list sections per drug,
+  verbatim section text.
+- **PR3 (last)**: query-history persistence (new Postgres column via
+  additive migration, new endpoint, frontend wiring).
+
+Each will get its own claim update / follow-up entry here as it starts.
+
+## PR1 — files claimed now
+
+- `apps/ai-service/rag/sections.py` — add a multi-match helper only;
+  `SectionResolver.resolve()`'s existing single-match behavior is
+  unchanged (other callers depend on "or nothing at all").
+- `apps/ai-service/rag/understanding.py` — detect when a turn names ≥2
+  distinct sections, route to the existing `missing_attribute` clarify
+  instead of silently collapsing to one and generating a wrong-scope answer.
+- `apps/ai-service/rag/agent.py` — vary the `out_of_scope` message
+  (price/vendor/brand vs. genuinely off-topic) instead of one shared string.
+- `apps/ai-service/rag/answer.py` — fixed, non-generated notice block on
+  `list_mode` (condition→drug) answers, same "module constant" pattern as
+  the existing `DISCLAIMER`.
+- `apps/ai-service/tests/test_understanding.py`,
+  `apps/ai-service/tests/test_section_routing.py`,
+  `apps/ai-service/tests/test_agent.py`,
+  `apps/ai-service/tests/test_grounded_generation.py` — new/updated tests
+  for the above.
+- `packages/ui/src/ChatBubble.tsx` — render the existing
+  `message.disclaimer` field per-message (data already flows end-to-end,
+  just never rendered).
+
+**Not touching**: `rag/service.py`, `rag/routing.py`, retrieval adapters,
+`ingestion/`, or anything under the pre-existing dirty `docs/` deletion
+block already in the working tree (unrelated restructuring, left alone).
+
+## Local-only, no deploy
+
+Per standing instruction: build + test locally only. No push, no PR open/merge,
+no deploy without the owner's explicit go for each PR. Postgres backup +
+`rollback.yml` awareness apply to PR3 (the only one with a schema change),
+noted in the plan file.

packages/ui/src/ChatBubble.tsx

@@ -306,6 +306,19 @@ export function ChatBubble({
           : renderStructuredContent(message.content, message.citations)}
       </div>
 
+      {/* Per-message disclaimer — `message.disclaimer` is populated by the
+          backend on every message (including abstain/clarify), never by
+          the model itself (`rag/answer.py`'s DISCLAIMER constant); this was
+          already flowing end-to-end but nothing rendered it, so it only
+          ever surfaced as one page-level banner (`DisclaimerBanner`), not
+          per answer as F-HT #22 ("mọi câu trả lời y tế đều có") requires. */}
+      {message.disclaimer && (
+        <p className="mt-1.5 px-4 flex items-start gap-1.5 text-[0.7rem] leading-snug text-txt-muted">
+          <Info className="h-3 w-3 shrink-0 mt-0.5" />
+          <span>{message.disclaimer}</span>
+        </p>
+      )}
+
       {/* Quick-reply chips — only for a clarify turn the model gave a few
           natural discrete answers to; free text always still works. */}
       {onQuickReply && message.quickReplies && message.quickReplies.length > 0 && (