diff --git a/v2/internal/config/config.go b/v2/internal/config/config.go
index f0fe0ec..2c02d1f 100644
--- a/v2/internal/config/config.go
+++ b/v2/internal/config/config.go
@@ -6,6 +6,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"net/url"
 	"os"
 	"path/filepath"
 	"regexp"
@@ -79,6 +80,8 @@ type rawSource struct {
 	URL            *string `json:"url"`
 	RTSPURL        *string `json:"rtsp_url"`
 	Host           *string `json:"host"`
+	Port           *int    `json:"port"`
+	Channel        *string `json:"channel"`
 	Username       *string `json:"username"`
 	Password       *string `json:"password"`
 	Transport      string  `json:"transport"`
@@ -131,8 +134,8 @@ func Load(path string) (Config, error) {
 	if raw.Source == nil || raw.Model == nil || raw.Tools == nil || raw.Event == nil || raw.Artifacts == nil {
 		return Config{}, fmt.Errorf("config requires source, model, tools, event and artifacts objects")
 	}
-	if raw.Source.URL != nil || raw.Source.RTSPURL != nil || raw.Source.Host != nil || raw.Source.Username != nil || raw.Source.Password != nil {
-		return Config{}, fmt.Errorf("source must define rtsp_url_env only; embedded URL and credentials are not allowed")
+	if raw.Source.URL != nil || raw.Source.RTSPURL != nil {
+		return Config{}, fmt.Errorf("source must define structured host fields or rtsp_url_env, not a full url or rtsp_url")
 	}
 
 	source, err := resolveSource(*raw.Source)
@@ -174,14 +177,6 @@ func resolveSource(raw rawSource) (SourceConfig, error) {
 	if strings.TrimSpace(raw.ID) == "" {
 		return SourceConfig{}, fmt.Errorf("source.id must be non-empty")
 	}
-	name := strings.TrimSpace(raw.RTSPURLEnv)
-	if !envPattern.MatchString(name) {
-		return SourceConfig{}, fmt.Errorf("source.rtsp_url_env must be an environment variable name")
-	}
-	url, found := os.LookupEnv(name)
-	if !found || strings.TrimSpace(url) == "" {
-		return SourceConfig{}, fmt.Errorf("missing source environment variable: %s", name)
-	}
 	transport := strings.ToLower(strings.TrimSpace(raw.Transport))
 	if transport == "" {
 		transport = "tcp"
@@ -200,10 +195,124 @@ func resolveSource(raw rawSource) (SourceConfig, error) {
 	if raw.LowLatency != nil {
 		lowLatency = *raw.LowLatency
 	}
-	return SourceConfig{
-		ID: strings.TrimSpace(raw.ID), URL: url, RTSPURLEnv: name, Transport: transport,
+
+	resolved := SourceConfig{
+		ID: strings.TrimSpace(raw.ID), Transport: transport,
 		Timeout: time.Duration(timeout * float64(time.Second)), LowLatency: lowLatency,
-	}, nil
+	}
+
+	if raw.Host != nil {
+		streamURL, err := structuredSourceURL(raw)
+		if err != nil {
+			return SourceConfig{}, err
+		}
+		resolved.URL = streamURL
+		return resolved, nil
+	}
+
+	name := strings.TrimSpace(raw.RTSPURLEnv)
+	if !envPattern.MatchString(name) {
+		return SourceConfig{}, fmt.Errorf("source.rtsp_url_env must be an environment variable name")
+	}
+	streamURL, found := os.LookupEnv(name)
+	if !found || strings.TrimSpace(streamURL) == "" {
+		return SourceConfig{}, fmt.Errorf("missing source environment variable: %s", name)
+	}
+	resolved.URL = streamURL
+	resolved.RTSPURLEnv = name
+	return resolved, nil
+}
+
+// structuredSourceURL builds an RTSP URL from local host/credential fields.
+// net/url percent-encodes the userinfo, so a password with @/:/ does not break
+// parsing. These fields are only permitted in the untracked local config.
+func structuredSourceURL(raw rawSource) (string, error) {
+	host := strings.TrimSpace(*raw.Host)
+	if host == "" {
+		return "", fmt.Errorf("source.host must be non-empty")
+	}
+	if raw.Username == nil || strings.TrimSpace(*raw.Username) == "" {
+		return "", fmt.Errorf("source.username must be non-empty")
+	}
+	if raw.Password == nil || *raw.Password == "" {
+		return "", fmt.Errorf("source.password must be non-empty")
+	}
+	port := 554
+	if raw.Port != nil {
+		port = *raw.Port
+	}
+	if port < 1 || port > 65535 {
+		return "", fmt.Errorf("source.port must be between 1 and 65535")
+	}
+	channel := "101"
+	if raw.Channel != nil && strings.TrimSpace(*raw.Channel) != "" {
+		channel = strings.TrimSpace(*raw.Channel)
+	}
+	return buildRTSPURL(host, port, strings.TrimSpace(*raw.Username), *raw.Password, channel), nil
+}
+
+// buildRTSPURL assembles a Hikvision RTSP URL with percent-encoded credentials.
+func buildRTSPURL(host string, port int, username, password, channel string) string {
+	address := url.URL{
+		Scheme: "rtsp",
+		User:   url.UserPassword(username, password),
+		Host:   fmt.Sprintf("%s:%d", host, port),
+		Path:   "/Streaming/Channels/" + channel,
+	}
+	return address.String()
+}
+
+// updateLocalConfig rewrites one untracked local config file, preserving blocks
+// the caller does not touch. Only ever call this on config.local.json.
+func updateLocalConfig(configPath string, mutate func(map[string]interface{})) error {
+	document := map[string]interface{}{}
+	if data, err := os.ReadFile(configPath); err == nil {
+		if err := json.Unmarshal(data, &document); err != nil {
+			return fmt.Errorf("parse local config: %w", err)
+		}
+	}
+	mutate(document)
+	out, err := json.MarshalIndent(document, "", "  ")
+	if err != nil {
+		return fmt.Errorf("encode local config: %w", err)
+	}
+	return os.WriteFile(configPath, append(out, '\n'), 0o600)
+}
+
+func objectOf(document map[string]interface{}, key string) map[string]interface{} {
+	if existing, ok := document[key].(map[string]interface{}); ok {
+		return existing
+	}
+	created := map[string]interface{}{}
+	document[key] = created
+	return created
+}
+
+// WriteLocalCameraSource persists a structured camera source (with plaintext
+// credentials) into the untracked local config. The public example must never
+// receive these fields.
+func WriteLocalCameraSource(configPath, id, host string, port int, channel, username, password, transport string, timeoutSeconds float64, lowLatency bool) error {
+	return updateLocalConfig(configPath, func(document map[string]interface{}) {
+		document["source"] = map[string]interface{}{
+			"id": id, "host": host, "port": port, "channel": channel,
+			"username": username, "password": password,
+			"transport": transport, "timeout_seconds": timeoutSeconds, "low_latency": lowLatency,
+		}
+	})
+}
+
+// WriteLocalEventTuning persists the common detection parameters into the
+// untracked local config, preserving other event/model fields.
+func WriteLocalEventTuning(configPath string, keypointConfidence, confirmWindowSeconds, horizontalAngleDegrees, modelConfidence float64, requireRapidDrop, requireLowerBody bool) error {
+	return updateLocalConfig(configPath, func(document map[string]interface{}) {
+		event := objectOf(document, "event")
+		event["keypoint_confidence_threshold"] = keypointConfidence
+		event["confirm_window_seconds"] = confirmWindowSeconds
+		event["horizontal_angle_threshold_degrees"] = horizontalAngleDegrees
+		event["require_rapid_drop"] = requireRapidDrop
+		event["require_lower_body"] = requireLowerBody
+		objectOf(document, "model")["confidence_threshold"] = modelConfidence
+	})
 }
 
 func resolveModel(configPath string, raw rawModel) (ModelConfig, error) {
diff --git a/v2/internal/config/config_structured_test.go b/v2/internal/config/config_structured_test.go
new file mode 100644
index 0000000..2e45e66
--- /dev/null
+++ b/v2/internal/config/config_structured_test.go
@@ -0,0 +1,140 @@
+package config
+
+import (
+	"encoding/json"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+func writeTempConfig(t *testing.T, content string) string {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "config.json")
+	if err := os.WriteFile(path, []byte(content), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	return path
+}
+
+func structuredConfigJSON() string {
+	return strings.Replace(validConfigJSON(),
+		`"rtsp_url_env": "SILVER_POSE_RTSP_URL",`,
+		`"host": "192.0.2.10", "port": 554, "channel": "102", "username": "admin", "password": "p@ss/w:d",`,
+		1)
+}
+
+func TestStructuredSourceBuildsLosslessEncodedURL(t *testing.T) {
+	cfg, err := Load(writeTempConfig(t, structuredConfigJSON()))
+	if err != nil {
+		t.Fatalf("load: %v", err)
+	}
+	if strings.Contains(cfg.Source.URL, "p@ss") {
+		t.Fatalf("password @ was not percent-encoded: %q", cfg.Source.URL)
+	}
+	parsed, err := url.Parse(cfg.Source.URL)
+	if err != nil {
+		t.Fatalf("built URL does not parse: %v", err)
+	}
+	if parsed.Hostname() != "192.0.2.10" || parsed.Port() != "554" {
+		t.Fatalf("host/port = %q/%q", parsed.Hostname(), parsed.Port())
+	}
+	if parsed.User.Username() != "admin" {
+		t.Fatalf("username = %q", parsed.User.Username())
+	}
+	if password, _ := parsed.User.Password(); password != "p@ss/w:d" {
+		t.Fatalf("password did not round-trip: %q", password)
+	}
+	if parsed.Path != "/Streaming/Channels/102" {
+		t.Fatalf("path = %q", parsed.Path)
+	}
+}
+
+func TestStructuredSourceRequiresPassword(t *testing.T) {
+	noPassword := strings.Replace(structuredConfigJSON(), `"password": "p@ss/w:d",`, "", 1)
+	if _, err := Load(writeTempConfig(t, noPassword)); err == nil || !strings.Contains(err.Error(), "password") {
+		t.Fatalf("expected password error, got %v", err)
+	}
+}
+
+func TestStructuredCredentialsExcludedFromConfigVersion(t *testing.T) {
+	first, err := Load(writeTempConfig(t, structuredConfigJSON()))
+	if err != nil {
+		t.Fatal(err)
+	}
+	other := strings.Replace(structuredConfigJSON(), `"password": "p@ss/w:d"`, `"password": "different"`, 1)
+	second, err := Load(writeTempConfig(t, other))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if first.Source.URL == second.Source.URL {
+		t.Fatal("test setup did not change the credential")
+	}
+	if first.RuntimeConfigVersion != second.RuntimeConfigVersion {
+		t.Fatal("runtime config version changed with a credential")
+	}
+}
+
+func TestPublicExampleHasNoEmbeddedCredentials(t *testing.T) {
+	data, err := os.ReadFile(filepath.Join("..", "..", "config.example.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	var document struct {
+		Source map[string]json.RawMessage `json:"source"`
+	}
+	if err := json.Unmarshal(data, &document); err != nil {
+		t.Fatal(err)
+	}
+	for _, forbidden := range []string{"host", "username", "password", "url", "rtsp_url"} {
+		if _, present := document.Source[forbidden]; present {
+			t.Fatalf("public example leaked credential field %q", forbidden)
+		}
+	}
+	if _, present := document.Source["rtsp_url_env"]; !present {
+		t.Fatal("public example missing rtsp_url_env")
+	}
+}
+
+func TestWriteLocalCameraSourceRoundTrips(t *testing.T) {
+	path := writeTempConfig(t, validConfigJSON())
+	if err := WriteLocalCameraSource(path, "hik", "192.0.2.20", 554, "102", "operator", "s@cret", "tcp", 5, true); err != nil {
+		t.Fatal(err)
+	}
+	cfg, err := Load(path)
+	if err != nil {
+		t.Fatalf("reload: %v", err)
+	}
+	if cfg.Source.ID != "hik" {
+		t.Fatalf("id = %q", cfg.Source.ID)
+	}
+	parsed, _ := url.Parse(cfg.Source.URL)
+	if parsed.Hostname() != "192.0.2.20" {
+		t.Fatalf("host = %q", parsed.Hostname())
+	}
+	if password, _ := parsed.User.Password(); password != "s@cret" {
+		t.Fatalf("password = %q", password)
+	}
+}
+
+func TestWriteLocalEventTuningRoundTrips(t *testing.T) {
+	path := writeTempConfig(t, validConfigJSON())
+	t.Setenv("SILVER_POSE_RTSP_URL", "rtsp://demo.invalid/live")
+	if err := WriteLocalEventTuning(path, 0.5, 2.5, 35, 0.3, true, true); err != nil {
+		t.Fatal(err)
+	}
+	cfg, err := Load(path)
+	if err != nil {
+		t.Fatalf("reload: %v", err)
+	}
+	if cfg.Event.ConfirmWindowSeconds != 2.5 || cfg.Event.HorizontalAngleThresholdDegrees != 35 {
+		t.Fatalf("event tuning not applied: %+v", cfg.Event)
+	}
+	if !cfg.Event.RequireRapidDrop || !cfg.Event.RequireLowerBody {
+		t.Fatalf("boolean tuning not applied: %+v", cfg.Event)
+	}
+	if cfg.Model.ConfidenceThreshold != 0.3 {
+		t.Fatalf("model confidence = %v", cfg.Model.ConfidenceThreshold)
+	}
+}