diff --git a/.helloagents/CHANGELOG.md b/.helloagents/CHANGELOG.md
index b2a5c67..4e283d8 100644
--- a/.helloagents/CHANGELOG.md
+++ b/.helloagents/CHANGELOG.md
@@ -9,6 +9,8 @@
 
 ### 变更
 
+- **[deploy/proxy/settings]**: 调整 stream usage 默认值并避免部署覆盖云端变量 — by lsy
+  - 方案: [202603170025_runtime-defaults-no-override](archive/2026-03/202603170025_runtime-defaults-no-override/)
 - **[deploy-workflow]**: 本地部署脚本改为纯本地流程（构建 + 本地迁移） — by lsy
   - 方案: [202603162008_local-deploy-local-only](archive/2026-03/202603162008_local-deploy-local-only/)
 - **[settings/admin-ui]**: 设置接口返回运行时配置，管理台只读展示并指引环境变量配置
diff --git a/.helloagents/modules/proxy.md b/.helloagents/modules/proxy.md
index 72aba86..a9f1ba1 100644
--- a/.helloagents/modules/proxy.md
+++ b/.helloagents/modules/proxy.md
@@ -38,7 +38,8 @@
 - 映射模型场景失败时同时记录下游模型错误，确保冷却窗口生效
 - 上游成功响应会刷新能力表，清空错误并延长可用窗口
 - CPU 保护开关（环境变量）: `PROXY_STREAM_USAGE_MODE`, `PROXY_STREAM_USAGE_MAX_BYTES`, `PROXY_STREAM_USAGE_MAX_PARSERS`, `PROXY_USAGE_QUEUE_ENABLED`
-- `PROXY_STREAM_USAGE_MAX_BYTES` 与 `PROXY_STREAM_USAGE_MAX_PARSERS` 设为 `0` 表示无限制（未配置则使用默认值）
+- 默认值: `PROXY_STREAM_USAGE_MODE=full`, `PROXY_STREAM_USAGE_MAX_BYTES=0`, `PROXY_STREAM_USAGE_MAX_PARSERS=0`, `PROXY_USAGE_QUEUE_ENABLED=true`
+- `PROXY_STREAM_USAGE_MAX_BYTES` 与 `PROXY_STREAM_USAGE_MAX_PARSERS` 设为 `0` 表示无限制
 
 ## 依赖关系
 - `channels` / `tokens` / `usage_logs` 表
diff --git a/.helloagents/modules/settings.md b/.helloagents/modules/settings.md
index e094c51..3f40a39 100644
--- a/.helloagents/modules/settings.md
+++ b/.helloagents/modules/settings.md
@@ -19,6 +19,7 @@
 - 模型失败冷却以分钟计（默认 10 分钟），用于跳过最近失败的渠道/模型
 - 代理 CPU 降载相关开关使用环境变量（非 DB 设置）
 - `GET /api/settings` 额外返回 `runtime_config`（环境变量读取结果），用于展示流式 usage 解析与队列状态
+- 运行时配置默认值为 `PROXY_STREAM_USAGE_MODE=full`、`PROXY_STREAM_USAGE_MAX_BYTES=0`、`PROXY_STREAM_USAGE_MAX_PARSERS=0`
 - 运行时配置中 `PROXY_STREAM_USAGE_MAX_BYTES/PROXY_STREAM_USAGE_MAX_PARSERS` 设为 `0` 表示无限制
 
 ## 依赖关系
diff --git a/apps/worker/src/routes/proxy.ts b/apps/worker/src/routes/proxy.ts
index b141f6f..0abdff6 100644
--- a/apps/worker/src/routes/proxy.ts
+++ b/apps/worker/src/routes/proxy.ts
@@ -80,9 +80,9 @@ type ErrorDetails = {
 
 const FAILURE_COUNT_THRESHOLD = 2;
 
-const STREAM_USAGE_DEFAULT_MODE: StreamUsageMode = "lite";
-const STREAM_USAGE_DEFAULT_MAX_BYTES = 256 * 1024;
-const STREAM_USAGE_DEFAULT_MAX_PARSERS = 2;
+const STREAM_USAGE_DEFAULT_MODE: StreamUsageMode = "full";
+const STREAM_USAGE_DEFAULT_MAX_BYTES = 0;
+const STREAM_USAGE_DEFAULT_MAX_PARSERS = 0;
 
 let activeStreamUsageParsers = 0;
 
diff --git a/apps/worker/src/services/settings.ts b/apps/worker/src/services/settings.ts
index 4fb45e0..39a1083 100644
--- a/apps/worker/src/services/settings.ts
+++ b/apps/worker/src/services/settings.ts
@@ -6,9 +6,9 @@ const DEFAULT_LOG_RETENTION_DAYS = 30;
 const DEFAULT_SESSION_TTL_HOURS = 12;
 const DEFAULT_CHECKIN_SCHEDULE_TIME = "00:10";
 const DEFAULT_MODEL_FAILURE_COOLDOWN_MINUTES = 10;
-const DEFAULT_PROXY_STREAM_USAGE_MODE = "lite";
-const DEFAULT_PROXY_STREAM_USAGE_MAX_BYTES = 256 * 1024;
-const DEFAULT_PROXY_STREAM_USAGE_MAX_PARSERS = 2;
+const DEFAULT_PROXY_STREAM_USAGE_MODE = "full";
+const DEFAULT_PROXY_STREAM_USAGE_MAX_BYTES = 0;
+const DEFAULT_PROXY_STREAM_USAGE_MAX_PARSERS = 0;
 const RETENTION_KEY = "log_retention_days";
 const SESSION_TTL_KEY = "session_ttl_hours";
 const ADMIN_PASSWORD_HASH_KEY = "admin_password_hash";
diff --git a/apps/worker/wrangler.toml b/apps/worker/wrangler.toml
index b6bb772..a3d65f2 100644
--- a/apps/worker/wrangler.toml
+++ b/apps/worker/wrangler.toml
@@ -2,14 +2,6 @@ name = "api-worker"
 main = "src/index.ts"
 compatibility_date = "2026-02-14"
 
-[vars]
-CORS_ORIGIN = "http://localhost:5173"
-PROXY_UPSTREAM_TIMEOUT_MS = "30000"
-PROXY_STREAM_USAGE_MODE = "lite"
-PROXY_STREAM_USAGE_MAX_BYTES = "262144"
-PROXY_STREAM_USAGE_MAX_PARSERS = "2"
-PROXY_USAGE_QUEUE_ENABLED = "true"
-
 [[d1_databases]]
 binding = "DB"
 database_name = "api-worker"