diff --git a/core/pkg/gateway/dependencies.go b/core/pkg/gateway/dependencies.go
index 3b053d6..dd6c048 100644
--- a/core/pkg/gateway/dependencies.go
+++ b/core/pkg/gateway/dependencies.go
@@ -173,11 +173,7 @@ func initializeRQLite(logger *logging.ColoredLogger, cfg *Config, deps *Dependen
 	// Inject basic auth credentials into DSN if available
 	dsn = injectRQLiteAuth(dsn, cfg.RQLiteUsername, cfg.RQLitePassword)
 
-	if strings.Contains(dsn, "?") {
-		dsn += "&disableClusterDiscovery=true&level=none"
-	} else {
-		dsn += "?disableClusterDiscovery=true&level=none"
-	}
+	dsn = appendRQLiteQueryParams(dsn)
 	db, err := sql.Open("rqlite", dsn)
 	if err != nil {
 		return fmt.Errorf("failed to open rqlite sql db: %w", err)
@@ -824,6 +820,28 @@ func injectRQLiteAuth(dsn, username, password string) string {
 	return dsn
 }
 
+// appendRQLiteQueryParams adds the standard query parameters to a RQLite DSN:
+//
+//   - `disableClusterDiscovery=true` — gorqlite's discovery /nodes call is
+//     unreliable when peers are unreachable; we manage topology ourselves.
+//   - `level=weak` — Bug #235. Reads route to the leader (the only node
+//     guaranteed to have all committed writes), so a SELECT after an UPDATE
+//     in the same serverless invocation sees the new state. Previously
+//     `level=none`, which read from the local follower's possibly-stale
+//     snapshot. gorqlite's upstream default is `weak`; we were overriding
+//     to `none` and that hid this bug.
+//
+// The cost of `weak` over `none` is one HTTP hop to the leader (~1-2ms over
+// the WireGuard mesh) and applies only to reads. Writes are unaffected
+// because rqlite always redirects them to the leader regardless of `level`.
+func appendRQLiteQueryParams(dsn string) string {
+	const params = "disableClusterDiscovery=true&level=weak"
+	if strings.Contains(dsn, "?") {
+		return dsn + "&" + params
+	}
+	return dsn + "?" + params
+}
+
 // buildPushDispatcher constructs the push subsystem.
 //
 // As of bug #220 follow-up, push always initializes when ClusterSecret is
diff --git a/core/pkg/gateway/dependencies_dsn_test.go b/core/pkg/gateway/dependencies_dsn_test.go
new file mode 100644
index 0000000..4e3834e
--- /dev/null
+++ b/core/pkg/gateway/dependencies_dsn_test.go
@@ -0,0 +1,59 @@
+package gateway
+
+import (
+	"strings"
+	"testing"
+)
+
+// TestAppendRQLiteQueryParams_consistencyLevelWeak is the regression guard
+// for bug #235. The DSN passed to gorqlite MUST encode `level=weak` so reads
+// route to the leader and see all committed writes from earlier in the same
+// serverless invocation. `level=none` (the previous default) read from the
+// local follower's possibly-stale state and broke `INSERT → UPDATE → SELECT`
+// patterns inside host functions.
+func TestAppendRQLiteQueryParams_consistencyLevelWeak(t *testing.T) {
+	got := appendRQLiteQueryParams("http://localhost:5001")
+	if !strings.Contains(got, "level=weak") {
+		t.Errorf("DSN missing level=weak (bug #235 regression):\n%s", got)
+	}
+	if strings.Contains(got, "level=none") {
+		t.Errorf("DSN must NOT carry level=none (bug #235):\n%s", got)
+	}
+	if !strings.Contains(got, "disableClusterDiscovery=true") {
+		t.Errorf("DSN missing disableClusterDiscovery=true:\n%s", got)
+	}
+}
+
+// TestAppendRQLiteQueryParams_existingQueryString — when the inbound DSN
+// already has a `?param=value` segment (e.g. authentication appended
+// upstream), the new params must be `&`-joined, not start a fresh `?`.
+func TestAppendRQLiteQueryParams_existingQueryString(t *testing.T) {
+	got := appendRQLiteQueryParams("http://localhost:5001?foo=bar")
+	if strings.Count(got, "?") != 1 {
+		t.Errorf("expected exactly one '?' in DSN, got: %s", got)
+	}
+	if !strings.Contains(got, "?foo=bar&disableClusterDiscovery=true&level=weak") {
+		t.Errorf("DSN didn't append params with '&' join:\n%s", got)
+	}
+}
+
+// TestAppendRQLiteQueryParams_noExistingQueryString — when no `?` is present,
+// the params must be introduced with a `?` not an `&`.
+func TestAppendRQLiteQueryParams_noExistingQueryString(t *testing.T) {
+	got := appendRQLiteQueryParams("http://localhost:5001")
+	if !strings.HasSuffix(got, "?disableClusterDiscovery=true&level=weak") {
+		t.Errorf("DSN didn't introduce query string with '?':\n%s", got)
+	}
+}
+
+// TestAppendRQLiteQueryParams_preservesAuthCredentials — credentials injected
+// upstream by injectRQLiteAuth must survive the param append unchanged.
+func TestAppendRQLiteQueryParams_preservesAuthCredentials(t *testing.T) {
+	got := appendRQLiteQueryParams("http://orama:secret@localhost:5001")
+	if !strings.Contains(got, "orama:secret@localhost:5001") {
+		t.Errorf("auth credentials lost:\n%s", got)
+	}
+	if !strings.Contains(got, "level=weak") {
+		t.Errorf("level=weak missing after auth-injected DSN:\n%s", got)
+	}
+}
diff --git a/core/pkg/rqlite/adapter.go b/core/pkg/rqlite/adapter.go
index c0c8479..8798216 100644
--- a/core/pkg/rqlite/adapter.go
+++ b/core/pkg/rqlite/adapter.go
@@ -14,14 +14,33 @@ type RQLiteAdapter struct {
 	db      *sql.DB
 }
 
-// NewRQLiteAdapter creates a new adapter that provides sql.DB interface for RQLite
-func NewRQLiteAdapter(manager *RQLiteManager) (*RQLiteAdapter, error) {
-	// Build DSN with optional basic auth credentials
-	dsn := fmt.Sprintf("http://localhost:%d?disableClusterDiscovery=true&level=none", manager.config.RQLitePort)
-	if manager.config.RQLiteUsername != "" && manager.config.RQLitePassword != "" {
-		dsn = fmt.Sprintf("http://%s:%s@localhost:%d?disableClusterDiscovery=true&level=none",
-			manager.config.RQLiteUsername, manager.config.RQLitePassword, manager.config.RQLitePort)
+// adapterReadConsistencyLevel is the rqlite consistency level used for
+// gateway-internal SQL reads. Set to `weak` (matches gorqlite's own upstream
+// default). MUST NOT be `none` — see bug #235: with `none`, reads serve from
+// the local SQLite of whichever node the client is connected to, including
+// followers that haven't replayed the most-recent Raft commits. Serverless
+// functions running an `INSERT → UPDATE → SELECT` pattern in a single
+// invocation saw the pre-write snapshot. `weak` routes reads to the leader,
+// which always has the committed state, at a cost of ~1-2ms LAN hop over
+// the WireGuard mesh.
+const adapterReadConsistencyLevel = "weak"
+
+// buildRQLiteDSN composes the DSN URL passed to gorqlite's stdlib driver.
+// Pulled out for unit testing — the URL must encode `level=weak` (bug #235)
+// in addition to `disableClusterDiscovery=true`.
+func buildRQLiteDSN(host string, port int, username, password string) string {
+	if username != "" && password != "" {
+		return fmt.Sprintf("http://%s:%s@%s:%d?disableClusterDiscovery=true&level=%s",
+			username, password, host, port, adapterReadConsistencyLevel)
 	}
+	return fmt.Sprintf("http://%s:%d?disableClusterDiscovery=true&level=%s",
+		host, port, adapterReadConsistencyLevel)
+}
+
+// NewRQLiteAdapter creates a new adapter that provides sql.DB interface for RQLite.
+func NewRQLiteAdapter(manager *RQLiteManager) (*RQLiteAdapter, error) {
+	dsn := buildRQLiteDSN("localhost", manager.config.RQLitePort,
+		manager.config.RQLiteUsername, manager.config.RQLitePassword)
 	db, err := sql.Open("rqlite", dsn)
 	if err != nil {
 		return nil, fmt.Errorf("failed to open RQLite SQL connection: %w", err)
diff --git a/core/pkg/rqlite/adapter_test.go b/core/pkg/rqlite/adapter_test.go
index 5a6ddc7..452078f 100644
--- a/core/pkg/rqlite/adapter_test.go
+++ b/core/pkg/rqlite/adapter_test.go
@@ -1,12 +1,48 @@
 package rqlite
 
 import (
+	"strings"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/assert"
 )
 
+// TestBuildRQLiteDSN_consistencyLevelWeak is the regression guard for bug
+// #235. The DSN MUST encode `level=weak` so reads route to the leader and
+// see all committed writes. `level=none` (the previous default) caused
+// serverless `INSERT → UPDATE → SELECT` patterns to return stale snapshots
+// when the local node was a follower lagging on Raft replay.
+func TestBuildRQLiteDSN_consistencyLevelWeak(t *testing.T) {
+	got := buildRQLiteDSN("localhost", 5001, "", "")
+	if !strings.Contains(got, "level=weak") {
+		t.Errorf("DSN missing level=weak (bug #235 regression):\n%s", got)
+	}
+	if strings.Contains(got, "level=none") {
+		t.Errorf("DSN must NOT carry level=none (bug #235):\n%s", got)
+	}
+	if !strings.Contains(got, "disableClusterDiscovery=true") {
+		t.Errorf("DSN missing disableClusterDiscovery=true:\n%s", got)
+	}
+}
+
+func TestBuildRQLiteDSN_withAuthCredentials(t *testing.T) {
+	got := buildRQLiteDSN("rqlite-host", 5001, "orama", "secret123")
+	if !strings.Contains(got, "orama:secret123@rqlite-host:5001") {
+		t.Errorf("DSN missing inline credentials:\n%s", got)
+	}
+	if !strings.Contains(got, "level=weak") {
+		t.Errorf("DSN with auth still missing level=weak:\n%s", got)
+	}
+}
+
+func TestBuildRQLiteDSN_noAuthOmitsCredentials(t *testing.T) {
+	got := buildRQLiteDSN("localhost", 5001, "", "")
+	if strings.Contains(got, "@localhost") {
+		t.Errorf("DSN should not include credentials when both empty:\n%s", got)
+	}
+}
+
 // TestAdapterPoolConstants verifies the connection pool configuration values
 // used in NewRQLiteAdapter match the expected tuning parameters.
 // These values are critical for RQLite performance and stale connection eviction.
diff --git a/core/pkg/rqlite/scanner.go b/core/pkg/rqlite/scanner.go
index 3581be3..4e02a48 100644
--- a/core/pkg/rqlite/scanner.go
+++ b/core/pkg/rqlite/scanner.go
@@ -108,7 +108,12 @@ func scanCurrentRowIntoStruct(rows *sql.Rows, cols []string, destStruct reflect.
 	}
 	fieldIndex := buildFieldIndex(destStruct.Type())
 	for i, c := range cols {
-		if idx, ok := fieldIndex[strings.ToLower(c)]; ok {
+		// normalizeColumnKey strips underscores so snake_case SQL columns
+		// match CamelCase struct field names (bug found via feature #65:
+		// `trigger_id` column vs `TriggerID` field silently failed to map,
+		// leaving rows with empty IDs/expressions and a cron scheduler
+		// stuck in a tight retry loop on phantom triggers).
+		if idx, ok := fieldIndex[normalizeColumnKey(c)]; ok {
 			field := destStruct.Field(idx)
 			if field.CanSet() {
 				if err := setReflectValue(field, raw[i]); err != nil {
@@ -130,7 +135,17 @@ func normalizeSQLValue(v any) any {
 	}
 }
 
-// buildFieldIndex creates a map of lowercase column names to field indices.
+// buildFieldIndex creates a map of normalized column keys to field indices.
+//
+// Column keys are normalized (lowercase + underscores stripped) so a
+// SQL column named `trigger_id` matches a struct field named `TriggerID`
+// without requiring an explicit `db:"trigger_id"` tag. Explicit tags still
+// take precedence over the field name when present.
+//
+// Without this normalization, snake_case ↔ CamelCase silently failed to
+// map and the scanner returned rows with zero-valued fields — exactly the
+// failure mode that broke the cron scheduler in feature #65 (DB had valid
+// rows, scheduler saw empty `trigger_id` / `cron_expression` every tick).
 func buildFieldIndex(t reflect.Type) map[string]int {
 	m := make(map[string]int)
 	for i := 0; i < t.NumField(); i++ {
@@ -146,11 +161,25 @@ func buildFieldIndex(t reflect.Type) map[string]int {
 		if col == "" {
 			col = f.Name
 		}
-		m[strings.ToLower(col)] = i
+		m[normalizeColumnKey(col)] = i
 	}
 	return m
 }
 
+// normalizeColumnKey lowercases its input and strips underscores so
+// scanner lookups work across naming conventions:
+//
+//	column "trigger_id"  -> "triggerid"
+//	column "TriggerID"   -> "triggerid"
+//	column "triggerID"   -> "triggerid"
+//	column "id"          -> "id"
+//
+// This is the central rule that lets snake_case SQL columns map onto
+// CamelCase Go struct fields without explicit `db:` tags.
+func normalizeColumnKey(s string) string {
+	return strings.ReplaceAll(strings.ToLower(s), "_", "")
+}
+
 // setReflectValue sets a reflect.Value from a raw SQL value.
 func setReflectValue(field reflect.Value, raw any) error {
 	if raw == nil {
diff --git a/core/pkg/rqlite/scanner_snake_case_test.go b/core/pkg/rqlite/scanner_snake_case_test.go
new file mode 100644
index 0000000..aac342c
--- /dev/null
+++ b/core/pkg/rqlite/scanner_snake_case_test.go
@@ -0,0 +1,104 @@
+package rqlite
+
+import (
+	"database/sql"
+	"testing"
+	"time"
+
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// TestScanIntoDest_snakeCaseColumnsCamelCaseFields is the end-to-end
+// regression guard for the feature #65 cron-scheduler bug. The scanner MUST
+// populate CamelCase struct fields from snake_case SQL columns even when
+// no `db:` tags are present on the struct.
+//
+// Pre-fix, rqlite returned valid `function_cron_triggers` rows with
+// non-empty `id` / `cron_expression` / `next_run_at`, but the cron
+// scheduler scanned them into a `CronDueRow` struct (no db tags) and got
+// back zero values: `TriggerID == ""`, `CronExpression == ""`. The
+// scheduler then logged "bad expression" every poll tick and never fired
+// any function — even though everything from the DB to the goroutine to
+// the HTTP API was working.
+//
+// This test reproduces that exact wiring against an in-memory SQLite db
+// so any regression on the snake/Camel mapping fails CI loudly.
+func TestScanIntoDest_snakeCaseColumnsCamelCaseFields(t *testing.T) {
+	db, err := sql.Open("sqlite3", ":memory:")
+	require.NoError(t, err)
+	defer db.Close()
+
+	_, err = db.Exec(`
+		CREATE TABLE function_cron_triggers (
+			id              TEXT PRIMARY KEY,
+			function_id     TEXT NOT NULL,
+			cron_expression TEXT NOT NULL,
+			next_run_at     TIMESTAMP
+		);
+		INSERT INTO function_cron_triggers VALUES
+			('10a70f79-35b3-4bc6-b173-aec3012b570d',
+			 'dfe55b75-9c39-45ce-b60e-c72b131350b2',
+			 '*/30 * * * * *',
+			 '2026-05-09T05:50:00Z');
+	`)
+	require.NoError(t, err)
+
+	rows, err := db.Query(`
+		SELECT id AS trigger_id, function_id, cron_expression, next_run_at
+		FROM function_cron_triggers
+	`)
+	require.NoError(t, err)
+	defer rows.Close()
+
+	// Mirror of pkg/serverless/triggers.CronDueRow — CamelCase fields,
+	// NO db tags, snake_case SQL columns. Pre-fix the fields stayed at
+	// zero values; post-fix they populate.
+	type cronDueRowLike struct {
+		TriggerID      string
+		FunctionID     string
+		CronExpression string
+		NextRunAt      time.Time
+	}
+
+	var dst []cronDueRowLike
+	require.NoError(t, scanIntoDest(rows, &dst))
+	require.Len(t, dst, 1)
+
+	got := dst[0]
+	assert.Equal(t, "10a70f79-35b3-4bc6-b173-aec3012b570d", got.TriggerID,
+		"TriggerID populated from `trigger_id` column (regression guard for feature #65)")
+	assert.Equal(t, "dfe55b75-9c39-45ce-b60e-c72b131350b2", got.FunctionID,
+		"FunctionID populated from `function_id` column")
+	assert.Equal(t, "*/30 * * * * *", got.CronExpression,
+		"CronExpression populated from `cron_expression` column")
+	assert.False(t, got.NextRunAt.IsZero(),
+		"NextRunAt populated from `next_run_at` column")
+	assert.Equal(t, 2026, got.NextRunAt.Year())
+}
+
+// TestScanIntoDest_explicitDBTagStillTakesPrecedence guarantees that adding
+// the snake-case fix didn't break callers that already supplied explicit
+// `db:` tags. Tag wins; no double-mapping ambiguity.
+func TestScanIntoDest_explicitDBTagStillTakesPrecedence(t *testing.T) {
+	db, err := sql.Open("sqlite3", ":memory:")
+	require.NoError(t, err)
+	defer db.Close()
+
+	_, err = db.Exec(`CREATE TABLE t (custom_col TEXT); INSERT INTO t VALUES ('hello');`)
+	require.NoError(t, err)
+
+	rows, err := db.Query(`SELECT custom_col FROM t`)
+	require.NoError(t, err)
+	defer rows.Close()
+
+	type tagged struct {
+		// Field name has nothing to do with the column; only the tag binds it.
+		Whatever string `db:"custom_col"`
+	}
+	var dst []tagged
+	require.NoError(t, scanIntoDest(rows, &dst))
+	require.Len(t, dst, 1)
+	assert.Equal(t, "hello", dst[0].Whatever)
+}
diff --git a/core/pkg/rqlite/scanner_test.go b/core/pkg/rqlite/scanner_test.go
index 911930f..34ee9b6 100644
--- a/core/pkg/rqlite/scanner_test.go
+++ b/core/pkg/rqlite/scanner_test.go
@@ -80,10 +80,15 @@ type structWithEmbedded struct {
 func TestBuildFieldIndex(t *testing.T) {
 	t.Run("tagged struct", func(t *testing.T) {
 		idx := buildFieldIndex(reflect.TypeOf(taggedStruct{}))
+		// Keys are normalized via normalizeColumnKey: lowercased and
+		// underscores stripped. So `user_name` and `UserName` both
+		// resolve to `username` and the scanner can match snake_case SQL
+		// columns onto CamelCase struct fields without explicit `db:` tags
+		// (feature #65 cron-scheduler bug fix).
 		assert.Equal(t, 0, idx["id"])
-		assert.Equal(t, 1, idx["user_name"])
-		assert.Equal(t, 2, idx["email_addr"])
-		assert.Equal(t, 3, idx["created_at"])
+		assert.Equal(t, 1, idx["username"])
+		assert.Equal(t, 2, idx["emailaddr"])
+		assert.Equal(t, 3, idx["createdat"])
 		assert.Len(t, idx, 4)
 	})
 
@@ -99,7 +104,8 @@ func TestBuildFieldIndex(t *testing.T) {
 		idx := buildFieldIndex(reflect.TypeOf(mixedStruct{}))
 		assert.Equal(t, 0, idx["id"])
 		assert.Equal(t, 1, idx["name"])
-		assert.Equal(t, 3, idx["is_active"])
+		// `is_active` normalizes to `isactive`.
+		assert.Equal(t, 3, idx["isactive"])
 		// "-" tag means the first part of the tag is "-", so it maps with key "-"
 		// The actual behavior: tag="-" → col="-" → stored as "-"
 		// Let's verify what actually happens
@@ -157,6 +163,59 @@ func TestBuildFieldIndex(t *testing.T) {
 		_, hasLowerID := idx["id"]
 		assert.True(t, hasLowerID)
 	})
+
+	// REGRESSION (feature #65 cron-scheduler bug): a struct with CamelCase
+	// fields and NO `db:` tags must map onto snake_case SQL columns.
+	// Pre-fix, the cron scheduler read DB rows with valid `trigger_id` and
+	// `cron_expression` columns into a `CronDueRow` struct with `TriggerID`
+	// and `CronExpression` fields — and got back zero values for both,
+	// because `triggerid` (the lowercased struct field name) didn't match
+	// `trigger_id` (the lowercased column name) in the index lookup.
+	t.Run("camelCase field maps to snake_case column without db tag", func(t *testing.T) {
+		type cronDueRowLike struct {
+			TriggerID      string
+			FunctionID     string
+			FunctionName   string
+			Namespace      string
+			CronExpression string
+		}
+		idx := buildFieldIndex(reflect.TypeOf(cronDueRowLike{}))
+
+		// Both spellings of the same key must resolve to the same field
+		// because of normalizeColumnKey.
+		for _, sqlCol := range []string{"trigger_id", "TriggerID", "triggerid"} {
+			pos, ok := idx[normalizeColumnKey(sqlCol)]
+			assert.True(t, ok, "column %q should map to TriggerID", sqlCol)
+			assert.Equal(t, 0, pos)
+		}
+		for _, sqlCol := range []string{"cron_expression", "CronExpression"} {
+			pos, ok := idx[normalizeColumnKey(sqlCol)]
+			assert.True(t, ok, "column %q should map to CronExpression", sqlCol)
+			assert.Equal(t, 4, pos)
+		}
+	})
+}
+
+// TestNormalizeColumnKey exercises the central rule that snake_case ↔
+// CamelCase map to the same scanner key. Pre-fix, the absence of this
+// normalization silently broke struct scanning for any multi-word column
+// name (the cron scheduler in feature #65 was the canary).
+func TestNormalizeColumnKey(t *testing.T) {
+	cases := map[string]string{
+		"id":              "id",
+		"ID":              "id",
+		"trigger_id":      "triggerid",
+		"TriggerID":       "triggerid",
+		"triggerID":       "triggerid",
+		"cron_expression": "cronexpression",
+		"CronExpression":  "cronexpression",
+		"":                "",
+		"_":               "",
+		"___":             "",
+	}
+	for in, want := range cases {
+		assert.Equal(t, want, normalizeColumnKey(in), "normalizeColumnKey(%q)", in)
+	}
 }
 
 // ---------------------------------------------------------------------------
diff --git a/sdk/package.json b/sdk/package.json
index de577bc..ad7a84e 100644
--- a/sdk/package.json
+++ b/sdk/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@debros/orama",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "TypeScript SDK for Orama Network - Database, PubSub, Cache, Storage, Vault, and more",
   "type": "module",
   "main": "./dist/index.js",
diff --git a/sdk/src/auth/client.ts b/sdk/src/auth/client.ts
index 49f55d3..69f49c4 100644
--- a/sdk/src/auth/client.ts
+++ b/sdk/src/auth/client.ts
@@ -53,13 +53,50 @@ export class AuthClient {
     }
   }
 
+  /**
+   * Exchange a stored refresh token for a fresh access token.
+   *
+   * Pulls the refresh token (and the namespace it was issued for) out of
+   * storage — both are persisted by `verify()` after a successful wallet
+   * sign-in. The gateway returns a new access token and may rotate the
+   * refresh token; we persist the rotated one if present.
+   *
+   * Bug #239: previously this method (a) sent no body and (b) read the
+   * wrong response field, so the call always 400-ed AND silently wrote
+   * `undefined` as the in-memory JWT. Both issues fixed.
+   */
   async refresh(): Promise<string> {
-    const response = await this.httpClient.post<{ token: string }>(
-      "/v1/auth/refresh"
-    );
-    const token = response.token;
-    this.setJwt(token);
-    return token;
+    const refreshToken = await this.storage.get("refreshToken");
+    if (!refreshToken) {
+      throw new Error(
+        "refresh failed: no refresh token in storage — call verify() first"
+      );
+    }
+    const namespace = (await this.storage.get("namespace")) ?? "default";
+
+    const response = await this.httpClient.post<{
+      access_token: string;
+      refresh_token?: string;
+      expires_in?: number;
+      subject?: string;
+      namespace?: string;
+      token_type?: string;
+    }>("/v1/auth/refresh", { refresh_token: refreshToken, namespace });
+
+    if (!response?.access_token) {
+      throw new Error("refresh failed: server returned no access_token");
+    }
+
+    this.setJwt(response.access_token);
+
+    // Rotate the stored refresh token if the server returned a new one
+    // (rqlite-side gateway currently echoes the same token; future versions
+    // may rotate, so handle both shapes).
+    if (response.refresh_token && response.refresh_token !== refreshToken) {
+      await this.storage.set("refreshToken", response.refresh_token);
+    }
+
+    return response.access_token;
   }
 
   /**
@@ -198,6 +235,14 @@ export class AuthClient {
       await this.storage.set("refreshToken", (response as any).refresh_token);
     }
 
+    // Persist the namespace this JWT was issued for so refresh() can
+    // include it in the refresh request body (the gateway scopes refresh
+    // tokens to the issuing namespace). Bug #239 — without this, refresh
+    // would default to "default" and fail for namespace-scoped sessions.
+    const issuedNamespace =
+      (response as any).namespace || params.namespace || "default";
+    await this.storage.set("namespace", issuedNamespace);
+
     return response as any;
   }
 
diff --git a/sdk/tests/unit/auth/refresh-bug-239.test.ts b/sdk/tests/unit/auth/refresh-bug-239.test.ts
new file mode 100644
index 0000000..24b3c46
--- /dev/null
+++ b/sdk/tests/unit/auth/refresh-bug-239.test.ts
@@ -0,0 +1,154 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { AuthClient } from "../../../src/auth/client";
+import { HttpClient } from "../../../src/core/http";
+import type { StorageAdapter } from "../../../src/auth/types";
+
+/**
+ * Bug #239 regression guard. Two pre-existing defects in
+ * AuthClient.refresh() were demonstrated by this file in its pre-fix form
+ * (the call carried no body and read the wrong response field, silently
+ * corrupting the in-memory JWT to undefined). Both have been fixed and
+ * the assertions below now lock in the correct behavior so the bug can't
+ * silently come back.
+ */
+describe("Bug #239 — AuthClient.refresh() regression guard", () => {
+  let fetchSpy: ReturnType<typeof vi.fn>;
+  let storage: StorageAdapter;
+  let memStore: Map<string, string>;
+
+  function setupGoodResponse() {
+    fetchSpy = vi.fn(async (_input: any, _init?: RequestInit) => {
+      return new Response(
+        // Server response shape matches
+        // core/pkg/gateway/handlers/auth/jwt_handler.go:106-113.
+        JSON.stringify({
+          access_token: "NEW-JWT-FROM-SERVER",
+          token_type: "Bearer",
+          expires_in: 900,
+          refresh_token: "rotated-refresh",
+          subject: "0xabc",
+          namespace: "anchat-test",
+        }),
+        { status: 200, headers: { "Content-Type": "application/json" } }
+      );
+    });
+    vi.stubGlobal("fetch", fetchSpy);
+  }
+
+  beforeEach(() => {
+    memStore = new Map<string, string>();
+    storage = {
+      get: async (k: string) => memStore.get(k),
+      set: async (k: string, v: string) => {
+        memStore.set(k, v);
+      },
+      delete: async (k: string) => {
+        memStore.delete(k);
+      },
+      clear: async () => {
+        memStore.clear();
+      },
+    };
+  });
+
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it("sends { refresh_token, namespace } in the request body", async () => {
+    setupGoodResponse();
+    await storage.set("refreshToken", "stored-refresh-tok");
+    await storage.set("namespace", "anchat-test");
+
+    const http = new HttpClient({ baseURL: "https://example.invalid" });
+    const auth = new AuthClient({ httpClient: http, storage });
+
+    await auth.refresh();
+
+    expect(fetchSpy).toHaveBeenCalledOnce();
+    const init = fetchSpy.mock.calls[0][1] as RequestInit;
+    expect(init?.body, "refresh() must send a JSON body").toBeDefined();
+
+    const sentBody = JSON.parse(init!.body as string);
+    expect(sentBody).toEqual({
+      refresh_token: "stored-refresh-tok",
+      namespace: "anchat-test",
+    });
+  });
+
+  it("reads access_token from the response and propagates it as the new JWT", async () => {
+    setupGoodResponse();
+    await storage.set("refreshToken", "stored-refresh-tok");
+    await storage.set("namespace", "anchat-test");
+
+    const http = new HttpClient({ baseURL: "https://example.invalid" });
+    const auth = new AuthClient({ httpClient: http, storage });
+
+    const returned = await auth.refresh();
+
+    expect(returned).toBe("NEW-JWT-FROM-SERVER");
+    expect(auth.getToken()).toBe("NEW-JWT-FROM-SERVER");
+  });
+
+  it("rotates the stored refresh token when the server returns a new one", async () => {
+    setupGoodResponse();
+    await storage.set("refreshToken", "old-refresh");
+    await storage.set("namespace", "anchat-test");
+
+    const http = new HttpClient({ baseURL: "https://example.invalid" });
+    const auth = new AuthClient({ httpClient: http, storage });
+
+    await auth.refresh();
+
+    expect(await storage.get("refreshToken")).toBe("rotated-refresh");
+  });
+
+  it("falls back to the 'default' namespace when none stored", async () => {
+    setupGoodResponse();
+    await storage.set("refreshToken", "stored-refresh-tok");
+    // No namespace set.
+
+    const http = new HttpClient({ baseURL: "https://example.invalid" });
+    const auth = new AuthClient({ httpClient: http, storage });
+
+    await auth.refresh();
+
+    const sentBody = JSON.parse(
+      (fetchSpy.mock.calls[0][1] as RequestInit)!.body as string
+    );
+    expect(sentBody.namespace).toBe("default");
+  });
+
+  it("throws (not silently undefined-ing the JWT) when no refresh token is stored", async () => {
+    // No refresh token in storage. Server should never be called.
+    fetchSpy = vi.fn();
+    vi.stubGlobal("fetch", fetchSpy);
+
+    const http = new HttpClient({ baseURL: "https://example.invalid" });
+    const auth = new AuthClient({ httpClient: http, storage });
+
+    await expect(auth.refresh()).rejects.toThrow(/no refresh token/i);
+    expect(fetchSpy).not.toHaveBeenCalled();
+    expect(auth.getToken()).toBeUndefined();
+  });
+
+  it("throws if the server response is missing access_token", async () => {
+    // Server returns 200 but with malformed body (no access_token).
+    fetchSpy = vi.fn(async () => {
+      return new Response(JSON.stringify({ token_type: "Bearer" }), {
+        status: 200,
+        headers: { "Content-Type": "application/json" },
+      });
+    });
+    vi.stubGlobal("fetch", fetchSpy);
+    await storage.set("refreshToken", "stored-refresh-tok");
+
+    const http = new HttpClient({ baseURL: "https://example.invalid" });
+    const auth = new AuthClient({ httpClient: http, storage });
+
+    await expect(auth.refresh()).rejects.toThrow(/no access_token/i);
+    // In-memory JWT must NOT be set to undefined — pre-fix this is what
+    // corrupted the auth state.
+    expect(auth.getToken()).toBeUndefined();
+  });
+});