diff --git a/prod/bingx/journal.py b/prod/bingx/journal.py
index 32686ce..7a7c0b6 100644
--- a/prod/bingx/journal.py
+++ b/prod/bingx/journal.py
@@ -12,6 +12,7 @@ from typing import Any
 from prod.ch_writer import ch_put
 from prod.ch_writer import ch_put_green
 from prod.ch_writer import ch_put_prodgreen
+from prod.ch_writer import ch_put_violet
 from prod.ch_writer import ch_put_pink
 
 # ─── Account event rate control (§10.2) ──────────────────────────────────────
@@ -175,6 +176,7 @@ _STRATEGY_DB_MAP: dict[str, str] = {
     "green": "dolphin_green",
     "prodgreen": "dolphin_prodgreen",
     "pink": "dolphin_pink",
+    "violet": "dolphin_violet",
 }
 
 _STRATEGY_SINK_MAP: dict[str, Any] = {
@@ -182,6 +184,7 @@ _STRATEGY_SINK_MAP: dict[str, Any] = {
     "green": ch_put_green,
     "prodgreen": ch_put_prodgreen,
     "pink": ch_put_pink,
+    "violet": ch_put_violet,
 }
 
 _STRATEGY_SINK_NAME_MAP: dict[str, str] = {
@@ -189,6 +192,7 @@ _STRATEGY_SINK_NAME_MAP: dict[str, str] = {
     "green": "ch_put_green",
     "prodgreen": "ch_put_prodgreen",
     "pink": "ch_put_pink",
+    "violet": "ch_put_violet",
 }
 
 
diff --git a/prod/ch_writer.py b/prod/ch_writer.py
index d02493c..541c150 100644
--- a/prod/ch_writer.py
+++ b/prod/ch_writer.py
@@ -547,6 +547,7 @@ _writer = _CHWriter(db="dolphin")
 _writer_green = _CHWriter(db="dolphin_green")
 _writer_prodgreen = _CHWriter(db="dolphin_prodgreen")
 _writer_pink = _CHWriter(db="dolphin_pink")
+_writer_violet = _CHWriter(db="dolphin_violet")
 
 
 def ch_put(table: str, row: dict) -> None:
@@ -577,6 +578,15 @@ def ch_put_pink(table: str, row: dict) -> None:
     _writer_pink.put(table, row)
 
 
+def ch_put_violet(table: str, row: dict) -> None:
+    """
+    Fire-and-forget insert into dolphin_violet.<table> (VIOLET / observe-only
+    rebuild runtime). Namespace isolation is a stage gate: VIOLET must never
+    write to dolphin or dolphin_pink.
+    """
+    _writer_violet.put(table, row)
+
+
 # ─── V7 decision journal (PINK §10 data volume / §37 routing) ────────────────
 PINK_V7_JOURNAL_DB = "dolphin_pink"
 V7_DECISION_TABLE = "v7_decision_events"
diff --git a/prod/clean_arch/violet/test_violet_namespace_isolation.py b/prod/clean_arch/violet/test_violet_namespace_isolation.py
new file mode 100644
index 0000000..8b2f962
--- /dev/null
+++ b/prod/clean_arch/violet/test_violet_namespace_isolation.py
@@ -0,0 +1,124 @@
+"""V1 GATE: VIOLET namespace isolation.
+
+Zero VIOLET writes may reach dolphin (BLUE) or dolphin_pink databases, BLUE
+or PINK Hazelcast maps, or PINK Zinc regions. This suite pins:
+  (a) the violet CH sink targets dolphin_violet exclusively;
+  (b) prod.bingx.journal resolves "violet" explicitly and does NOT hit the
+      legacy fallback that routes unknown strategies into BLUE's dolphin DB;
+  (c) Zinc region names for prefix "violet" are disjoint from "pink";
+  (d) the persistence layer wired with the violet sink writes only to
+      dolphin_violet.
+"""
+
+from __future__ import annotations
+
+import sys
+
+sys.path.insert(0, "/mnt/dolphinng5_predict")
+sys.path.insert(0, "/mnt/dolphinng5_predict/nautilus_dolphin")
+
+import pytest
+
+
+def test_ch_put_violet_targets_dolphin_violet(monkeypatch):
+    import prod.ch_writer as chw
+
+    captured = []
+    monkeypatch.setattr(
+        chw._writer_violet, "put", lambda table, row: captured.append(("dolphin_violet", table))
+    )
+    monkeypatch.setattr(
+        chw._writer, "put", lambda table, row: captured.append(("dolphin", table))
+    )
+    monkeypatch.setattr(
+        chw._writer_pink, "put", lambda table, row: captured.append(("dolphin_pink", table))
+    )
+    chw.ch_put_violet("status_snapshots", {"x": 1})
+    assert captured == [("dolphin_violet", "status_snapshots")]
+
+
+def test_journal_sink_resolves_violet_not_blue_fallback():
+    """The line-~210 fallback returns ch_put (BLUE dolphin DB) for unknown
+    strategies — 'violet' must resolve explicitly, never via fallback."""
+    from prod.bingx import journal as j
+    from prod.ch_writer import ch_put, ch_put_violet
+
+    assert j._STRATEGY_DB_MAP.get("violet") == "dolphin_violet"
+    sink = j._sink_for_strategy("violet")
+    assert sink is ch_put_violet
+    assert sink is not ch_put
+    assert j._db_for_strategy("violet") == "dolphin_violet"
+    # regression: a truly-unknown strategy still falls back to BLUE — the
+    # hazard the violet entry exists to avoid (documents the footgun).
+    assert j._sink_for_strategy("chartreuse") is ch_put
+
+
+def test_zinc_region_names_disjoint_from_pink():
+    from prod.clean_arch.dita_v2.real_zinc_plane import RealZincPlane
+
+    # Region names derive from the prefix; compute without creating regions.
+    def names(prefix: str):
+        base = prefix.strip("/").replace("/", "_")
+        return {f"{base}_intent", f"{base}_state", f"{base}_control"}
+
+    assert names("violet").isdisjoint(names("pink"))
+    # the derivation rule above must match the class's own (guard against
+    # silent renames in real_zinc_plane)
+    import inspect
+
+    src = inspect.getsource(RealZincPlane.__init__)
+    for piece in ("_intent", "_state", "_control"):
+        assert piece in src
+
+
+def test_persistence_with_violet_sink_writes_only_dolphin_violet(monkeypatch):
+    """PinkClickHousePersistence(sink=ch_put_violet) — every row lands in
+    dolphin_violet; zero rows reach the BLUE/PINK writers."""
+    import prod.ch_writer as chw
+    from prod.clean_arch.persistence.pink_clickhouse import PinkClickHousePersistence
+
+    dbs = []
+    monkeypatch.setattr(chw._writer_violet, "put", lambda t, r: dbs.append("dolphin_violet"))
+    monkeypatch.setattr(chw._writer, "put", lambda t, r: dbs.append("dolphin"))
+    monkeypatch.setattr(chw._writer_pink, "put", lambda t, r: dbs.append("dolphin_pink"))
+    monkeypatch.setattr(chw._writer_green, "put", lambda t, r: dbs.append("dolphin_green"))
+    monkeypatch.setattr(chw._writer_prodgreen, "put", lambda t, r: dbs.append("dolphin_prodgreen"))
+
+    from prod.clean_arch.dita_v2.account import AccountProjection
+
+    p = PinkClickHousePersistence(
+        AccountProjection(), sink=chw.ch_put_violet, v7_sink=chw.ch_put_violet
+    )
+    # Drive a representative write path: the recovery/state writer.
+    try:
+        p.persist_recovery_state(snapshot=None, acc_dict={
+            "capital": 25_000.0, "equity": 25_000.0, "open_positions": 0,
+        })
+    except Exception:
+        pass  # row-shape errors are fine — we only assert ROUTING
+    assert "dolphin" not in dbs
+    assert "dolphin_pink" not in dbs
+    assert set(dbs) <= {"dolphin_violet"}
+
+
+def test_violet_hz_map_names():
+    """The V1 launcher's defaults must be violet-namespaced (string contract
+    pinned here before the launcher lands in C4)."""
+    expected = {
+        "state_map": "DOLPHIN_STATE_VIOLET",
+        "pnl_map": "DOLPHIN_PNL_VIOLET",
+        "journal_db": "dolphin_violet",
+        "journal_strategy": "violet",
+        "trader_id": "DOLPHIN-VIOLET-001",
+        "strategy_name": "violet",
+    }
+    try:
+        from prod.launch_dolphin_violet import VIOLET_DEFAULTS
+    except ImportError:
+        pytest.skip("launcher lands in C4 — contract pinned for then")
+    for k, v in expected.items():
+        assert VIOLET_DEFAULTS[k] == v
+
+
+if __name__ == "__main__":
+    raise SystemExit(pytest.main([__file__, "-v"]))