diff --git a/src/tmq/events.py b/src/tmq/events.py
index 4b459ab..ce0a08e 100644
--- a/src/tmq/events.py
+++ b/src/tmq/events.py
@@ -166,6 +166,69 @@ def append_event(
     return event_id
 
 
+# ── Model resolution ──────────────────────────────────────────────
+
+# Map model → provider from the known fleet configuration.
+# See institutional memory: data-driven-model-selection.md.
+# Refines tms/lib/tms/events.py:MODEL_TO_PROVIDER (tms#73).
+# tmq#7's resolver is more aggressive: known fleet models always
+# resolve to their mapped provider, overriding any caller-supplied
+# provider (intentional divergence from tms#73, which preserves
+# explicit providers even for known models).
+MODEL_TO_PROVIDER = {
+    "deepseek-v4-pro": "deepseek",
+    "MiniMax-M3": "minimax",
+    "MiniMax-M3.5": "minimax",
+    "glm-5.2": "zai",
+}
+
+
+def _resolve_default_model() -> tuple[str, str]:
+    """Resolve the actually-served model from pi's settings file.
+
+    When tmq dispatches pi without --provider/--model flags, the agent
+    uses the default from ~/.pi/agent/settings.json. We resolve this
+    at event-write time so the dispatch record carries the real model,
+    not an empty string. Returns (provider, model) tuple.
+    """
+    import json as _json
+
+    settings_path = os.path.expanduser("~/.pi/agent/settings.json")
+    try:
+        with open(settings_path) as f:
+            settings = _json.load(f)
+    except (FileNotFoundError, _json.JSONDecodeError, OSError):
+        return ("", "")
+
+    model = settings.get("defaultModel", "")
+    if not model:
+        return ("", "")
+
+    provider = MODEL_TO_PROVIDER.get(model, "unknown")
+    return (provider, model)
+
+
+def _resolve_dispatch_model(provider: str, model: str) -> tuple[str, str]:
+    """Resolve event provenance from explicit flags, then pi defaults.
+
+    Refines tms#73: an explicit model determines its provider from the
+    fleet map, and the mapping is authoritative — a known model always
+    resolves to its mapped provider, overriding any caller-supplied
+    provider (tms#73 preserves explicit providers even for known models;
+    this divergence is intentional so stale defaults can't leak).
+    For unknown models, the explicit provider (if any) is preserved.
+    Defaults are consulted only when the invocation supplies no model.
+    """
+    if model:
+        resolved = MODEL_TO_PROVIDER.get(model)
+        if resolved:
+            return (resolved, model)
+        return (provider or "unknown", model)
+
+    resolved_provider, resolved_model = _resolve_default_model()
+    return (provider or resolved_provider, resolved_model)
+
+
 def log_dispatch(
     *,
     repo: str,
@@ -185,6 +248,7 @@ def log_dispatch(
     so the metrics rows distinguish them; aoe_id is the 8-char prefix
     the bash tool computed via ``aoe session show --json``.
     """
+    provider, model = _resolve_dispatch_model(provider, model)
     return append_event(
         event_type="dispatch",
         repo=repo,
@@ -215,6 +279,7 @@ def log_dispatch_failed(
     """The failure path: tms#39 (cc root refusal), aoe add failed, aoe
     session start failed, etc. ``reason`` is the actionable hint.
     """
+    provider, model = _resolve_dispatch_model(provider, model)
     return append_event(
         event_type="dispatch_failed",
         repo=repo,
diff --git a/tests/test_events.py b/tests/test_events.py
new file mode 100644
index 0000000..dabc35e
--- /dev/null
+++ b/tests/test_events.py
@@ -0,0 +1,174 @@
+"""Tests for src/tmq/events.py — provider/model provenance.
+
+Mirrors tms#73's parameterized tests for _resolve_dispatch_model.
+Tests are ported to the bogocat-tmq API surface (log_dispatch /
+log_dispatch_failed) but assert the same resolution contract.
+
+Database isolation: events.py writes to postgres via psycopg2.
+Tests patch psycopg2.connect to capture the INSERT SQL + params
+so we assert what the row would contain without needing a real DB.
+"""
+
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+
+# ── Shared fixtures ───────────────────────────────────────────────
+
+
+def _capture_insert(mock_connect):
+    """Set up mock psycopg2 so we can capture the INSERT params."""
+    mock_conn = MagicMock()
+    mock_cursor = MagicMock()
+    mock_conn.__enter__.return_value = mock_conn
+    mock_conn.cursor.return_value.__enter__.return_value = mock_cursor
+    mock_connect.return_value = mock_conn
+    return mock_cursor
+
+
+def _last_insert_params(mock_cursor):
+    """Return the params tuple from the most recent execute() call."""
+    call_args = mock_cursor.execute.call_args
+    if call_args is None:
+        return None
+    return call_args[0][1]  # args[0] = (sql, params)
+
+
+# ── Tests ─────────────────────────────────────────────────────────
+
+
+class TestLogDispatchProviderResolution:
+    """Provider/model provenance for log_dispatch (tms#83)."""
+
+    def test_explicit_model_derives_provider(self):
+        """A --model without --provider derives provider from the fleet map."""
+        with patch("psycopg2.connect") as mock_connect:
+            cursor = _capture_insert(mock_connect)
+            from tmq.events import log_dispatch
+
+            log_dispatch(
+                repo="tms", issue=83, agent="pi",
+                provider="", model="MiniMax-M3",
+                dispatch_type="fix", cwd="/tmp/wt", session_name="fix-tms#83",
+            )
+            params = _last_insert_params(cursor)
+            # provider column (index 7 in INSERT: id,created_at,event_ts,event_type,
+            # repo,issue,agent,provider,model,...)
+            assert params[7] == "minimax"
+            assert params[8] == "MiniMax-M3"
+
+    def test_explicit_provider_and_model_preserved(self):
+        """Explicit provider + model passed through unchanged."""
+        with patch("psycopg2.connect") as mock_connect:
+            cursor = _capture_insert(mock_connect)
+            from tmq.events import log_dispatch
+
+            log_dispatch(
+                repo="tms", issue=83, agent="pi",
+                provider="custom-p", model="custom-m",
+                dispatch_type="fix", cwd="/tmp/wt", session_name="fix-tms#83",
+            )
+            params = _last_insert_params(cursor)
+            assert params[7] == "custom-p"
+            assert params[8] == "custom-m"
+
+    @pytest.mark.parametrize(
+        ("model", "expected_provider"),
+        [
+            ("deepseek-v4-pro", "deepseek"),
+            ("MiniMax-M3", "minimax"),
+            ("MiniMax-M3.5", "minimax"),
+            ("glm-5.2", "zai"),
+        ],
+    )
+    def test_each_known_model_gets_correct_provider(self, model, expected_provider):
+        """Every fleet model maps to its known provider (tms#73 ports)."""
+        with patch("psycopg2.connect") as mock_connect:
+            cursor = _capture_insert(mock_connect)
+            from tmq.events import log_dispatch
+
+            log_dispatch(
+                repo="tms", issue=83, agent="pi",
+                provider="", model=model,
+                dispatch_type="fix", cwd="/tmp/wt", session_name="fix-tms#83",
+            )
+            params = _last_insert_params(cursor)
+            assert params[7] == expected_provider
+            assert params[8] == model
+
+    def test_explicit_model_ignores_default_provider(self):
+        """An explicit --model must NOT combine with a stale default provider.
+
+        If the caller sets provider='stale-default' (from settings) but no
+        explicit --model, defaults are consulted. But with an explicit model,
+        the provider is derived from the model, not the stale default.
+        """
+        with patch("psycopg2.connect") as mock_connect:
+            cursor = _capture_insert(mock_connect)
+            from tmq.events import log_dispatch
+
+            # Simulate: settings.pi_provider='stale-default' but args.model='MiniMax-M3'
+            log_dispatch(
+                repo="tms", issue=83, agent="pi",
+                provider="stale-default", model="MiniMax-M3",
+                dispatch_type="fix", cwd="/tmp/wt", session_name="fix-tms#83",
+            )
+            params = _last_insert_params(cursor)
+            assert params[7] == "minimax", (
+                "explicit model should override stale default provider"
+            )
+            assert params[8] == "MiniMax-M3"
+
+    def test_empty_both_resolves_from_defaults(self):
+        """Empty provider + model resolves from pi settings defaults."""
+        with patch("psycopg2.connect") as mock_connect:
+            cursor = _capture_insert(mock_connect)
+            with patch("tmq.events._resolve_default_model",
+                       return_value=("deepseek", "deepseek-v4-pro")):
+                from tmq.events import log_dispatch
+
+                log_dispatch(
+                    repo="tms", issue=83, agent="pi",
+                    provider="", model="",
+                    dispatch_type="fix", cwd="/tmp/wt", session_name="fix-tms#83",
+                )
+                params = _last_insert_params(cursor)
+                assert params[7] == "deepseek"
+                assert params[8] == "deepseek-v4-pro"
+
+
+class TestLogDispatchFailedProviderResolution:
+    """Provider/model provenance for log_dispatch_failed (tms#83)."""
+
+    def test_explicit_model_derives_provider_on_failure(self):
+        """dispatch_failed must also resolve provider from model."""
+        with patch("psycopg2.connect") as mock_connect:
+            cursor = _capture_insert(mock_connect)
+            from tmq.events import log_dispatch_failed
+
+            log_dispatch_failed(
+                repo="tms", issue=83, agent="pi",
+                provider="", model="MiniMax-M3.5",
+                dispatch_type="fix", reason="aoe add failed",
+            )
+            params = _last_insert_params(cursor)
+            assert params[7] == "minimax"
+            assert params[8] == "MiniMax-M3.5"
+
+    def test_failed_uses_defaults_when_empty(self):
+        """Failed dispatch with no model resolves from pi settings."""
+        with patch("psycopg2.connect") as mock_connect:
+            cursor = _capture_insert(mock_connect)
+            with patch("tmq.events._resolve_default_model",
+                       return_value=("zai", "glm-5.2")):
+                from tmq.events import log_dispatch_failed
+
+                log_dispatch_failed(
+                    repo="tms", issue=83, agent="pi",
+                    provider="", model="",
+                    dispatch_type="fix", reason="timeout",
+                )
+                params = _last_insert_params(cursor)
+                assert params[7] == "zai"
+                assert params[8] == "glm-5.2"