diff --git a/src/psyc/db.py b/src/psyc/db.py
index 1b12436..0f7506d 100644
--- a/src/psyc/db.py
+++ b/src/psyc/db.py
@@ -114,6 +114,33 @@ Index("iocs_value_idx", iocs.c.value)
 Index("iocs_type_idx", iocs.c.ioc_type)
 Index("iocs_case_idx", iocs.c.case_id)
 
+peers = Table(
+    "peers", _metadata,
+    Column("domain", String, primary_key=True),
+    Column("fingerprint", String, nullable=False),
+    Column("pubkey_pem", Text, nullable=False),
+    Column("status", String, nullable=False),   # unknown | trusted | blocked
+    Column("discovered_at", String, nullable=False),
+    Column("last_seen", String, nullable=True),
+    Column("notes", Text, nullable=True),
+)
+Index("peers_fp_idx", peers.c.fingerprint)
+Index("peers_status_idx", peers.c.status)
+
+federation_signals = Table(
+    "federation_signals", _metadata,
+    Column("id", Integer, primary_key=True, autoincrement=True),
+    Column("peer_fingerprint", String, nullable=False),
+    Column("signal_type", String, nullable=False),   # case | ioc
+    Column("signal_id", String, nullable=False),     # case_id or ioc value
+    Column("signal_hash", String, nullable=False),   # sha256 of canonical record
+    Column("received_at", String, nullable=False),
+    Column("raw_json", Text, nullable=False),
+)
+Index("federation_signals_hash_idx", federation_signals.c.signal_hash)
+Index("federation_signals_peer_idx", federation_signals.c.peer_fingerprint)
+Index("federation_signals_received_idx", federation_signals.c.received_at.desc())
+
 
 _log = log.get(__name__)
 _engine: Optional[Engine] = None
@@ -214,3 +241,61 @@ def ioc_count(db_path: Path = DB_PATH) -> int:
     stmt = select(func.count()).select_from(iocs)
     with engine(db_path).connect() as conn:
         return conn.execute(stmt).scalar_one()
+
+
+# ---------- federation: peers + signal buffer ----------------------------
+
+def upsert_peer(row: dict, db_path: Path = DB_PATH) -> None:
+    """Insert-or-update a peer by domain. `row` must include `domain`."""
+    stmt = sqlite_insert(peers).values(**row)
+    update_cols = {k: stmt.excluded[k] for k in row if k != "domain"}
+    stmt = stmt.on_conflict_do_update(index_elements=[peers.c.domain], set_=update_cols)
+    with engine(db_path).begin() as conn:
+        conn.execute(stmt)
+
+
+def list_peers(db_path: Path = DB_PATH) -> List[dict]:
+    stmt = select(peers).order_by(peers.c.discovered_at.desc())
+    with engine(db_path).connect() as conn:
+        return [dict(r._mapping) for r in conn.execute(stmt).fetchall()]
+
+
+def get_peer(domain: str, db_path: Path = DB_PATH) -> Optional[dict]:
+    stmt = select(peers).where(peers.c.domain == domain)
+    with engine(db_path).connect() as conn:
+        row = conn.execute(stmt).fetchone()
+    return dict(row._mapping) if row else None
+
+
+def set_peer_status(domain: str, status: str, db_path: Path = DB_PATH) -> None:
+    from sqlalchemy import update as sa_update
+    stmt = sa_update(peers).where(peers.c.domain == domain).values(status=status)
+    with engine(db_path).begin() as conn:
+        conn.execute(stmt)
+
+
+def remove_peer(domain: str, db_path: Path = DB_PATH) -> None:
+    stmt = peers.delete().where(peers.c.domain == domain)
+    with engine(db_path).begin() as conn:
+        conn.execute(stmt)
+
+
+def record_signal(row: dict, db_path: Path = DB_PATH) -> int:
+    """Append one federation signal. Returns the inserted row id."""
+    stmt = insert(federation_signals).values(**row)
+    with engine(db_path).begin() as conn:
+        res = conn.execute(stmt)
+        return int(res.inserted_primary_key[0])
+
+
+def signals_for_hash(signal_hash: str, db_path: Path = DB_PATH) -> List[dict]:
+    """All recorded signals matching `signal_hash` — quorum-lookup primitive."""
+    stmt = select(federation_signals).where(federation_signals.c.signal_hash == signal_hash)
+    with engine(db_path).connect() as conn:
+        return [dict(r._mapping) for r in conn.execute(stmt).fetchall()]
+
+
+def recent_signals(limit: int = 200, db_path: Path = DB_PATH) -> List[dict]:
+    stmt = select(federation_signals).order_by(federation_signals.c.received_at.desc()).limit(limit)
+    with engine(db_path).connect() as conn:
+        return [dict(r._mapping) for r in conn.execute(stmt).fetchall()]