diff --git a/jive-api/src/main.rs b/jive-api/src/main.rs
index 82c21bdb..3c03939b 100644
--- a/jive-api/src/main.rs
+++ b/jive-api/src/main.rs
@@ -24,6 +24,7 @@ use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
 // 使用库中的模块
 use jive_money_api::{handlers, services, ws};
+mod metrics;
 
 // 导入处理器
 use handlers::accounts::*;
@@ -278,6 +279,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
             "/api/v1/transactions/statistics",
             get(get_transaction_statistics),
         )
+        // Metrics endpoint
+        .route("/metrics", get(metrics::metrics_handler))
         // 收款人管理 API
         .route("/api/v1/payees", get(list_payees))
         .route("/api/v1/payees", post(create_payee))
diff --git a/jive-api/src/metrics.rs b/jive-api/src/metrics.rs
new file mode 100644
index 00000000..57bd88da
--- /dev/null
+++ b/jive-api/src/metrics.rs
@@ -0,0 +1,65 @@
+use crate::AppState;
+use axum::{http::StatusCode, response::IntoResponse};
+use sqlx::PgPool;
+
+// Produce Prometheus-style metrics text.
+pub async fn metrics_handler(
+    axum::extract::State(state): axum::extract::State<AppState>,
+) -> impl IntoResponse {
+    let pool: &PgPool = &state.pool;
+    // Query hash distribution (best-effort)
+    let (b2a, b2b, b2y, a2id) = if let Ok(row) = sqlx::query(
+        "SELECT \
+            COUNT(*) FILTER (WHERE password_hash LIKE '$2a$%') AS b2a,\
+            COUNT(*) FILTER (WHERE password_hash LIKE '$2b$%') AS b2b,\
+            COUNT(*) FILTER (WHERE password_hash LIKE '$2y$%') AS b2y,\
+            COUNT(*) FILTER (WHERE password_hash LIKE '$argon2id$%') AS a2id\
+         FROM users",
+    )
+    .fetch_one(pool)
+    .await
+    {
+        use sqlx::Row;
+        (
+            row.try_get::<i64, _>("b2a").unwrap_or(0),
+            row.try_get::<i64, _>("b2b").unwrap_or(0),
+            row.try_get::<i64, _>("b2y").unwrap_or(0),
+            row.try_get::<i64, _>("a2id").unwrap_or(0),
+        )
+    } else {
+        (0, 0, 0, 0)
+    };
+
+    let rehash_count = state.metrics.get_rehash_count();
+    let mut buf = String::new();
+    buf.push_str("# HELP jive_password_rehash_total Total successful bcrypt to argon2id password rehashes.\n");
+    buf.push_str("# TYPE jive_password_rehash_total counter\n");
+    buf.push_str(&format!("jive_password_rehash_total {}\n", rehash_count));
+    buf.push_str("# HELP jive_password_hash_users Users by password hash algorithm variant.\n");
+    buf.push_str("# TYPE jive_password_hash_users gauge\n");
+    buf.push_str(&format!(
+        "jive_password_hash_users{{algo=\"bcrypt_2a\"}} {}\n",
+        b2a
+    ));
+    buf.push_str(&format!(
+        "jive_password_hash_users{{algo=\"bcrypt_2b\"}} {}\n",
+        b2b
+    ));
+    buf.push_str(&format!(
+        "jive_password_hash_users{{algo=\"bcrypt_2y\"}} {}\n",
+        b2y
+    ));
+    buf.push_str(&format!(
+        "jive_password_hash_users{{algo=\"argon2id\"}} {}\n",
+        a2id
+    ));
+
+    (
+        StatusCode::OK,
+        [(
+            axum::http::header::CONTENT_TYPE,
+            "text/plain; version=0.0.4",
+        )],
+        buf,
+    )
+}
diff --git a/jive-api/target/.rustc_info.json b/jive-api/target/.rustc_info.json
index 660295c8..2e254c01 100644
--- a/jive-api/target/.rustc_info.json
+++ b/jive-api/target/.rustc_info.json
@@ -1 +1 @@
-{"rustc_fingerprint":1863893085117187729,"outputs":{"18122065246313386177":{"success":true,"status":"","code":0,"stdout":"rustc 1.89.0 (29483883e 2025-08-04)\nbinary: rustc\ncommit-hash: 29483883eed69d5fb4db01964cdf2af4d86e9cb2\ncommit-date: 2025-08-04\nhost: aarch64-apple-darwin\nrelease: 1.89.0\nLLVM version: 20.1.7\n","stderr":""},"13007759520587589747":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.dylib\nlib___.dylib\nlib___.a\nlib___.dylib\n/Users/huazhou/.rustup/toolchains/stable-aarch64-apple-darwin\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"aarch64\"\ntarget_endian=\"little\"\ntarget_env=\"\"\ntarget_family=\"unix\"\ntarget_feature=\"aes\"\ntarget_feature=\"crc\"\ntarget_feature=\"dit\"\ntarget_feature=\"dotprod\"\ntarget_feature=\"dpb\"\ntarget_feature=\"dpb2\"\ntarget_feature=\"fcma\"\ntarget_feature=\"fhm\"\ntarget_feature=\"flagm\"\ntarget_feature=\"fp16\"\ntarget_feature=\"frintts\"\ntarget_feature=\"jsconv\"\ntarget_feature=\"lor\"\ntarget_feature=\"lse\"\ntarget_feature=\"neon\"\ntarget_feature=\"paca\"\ntarget_feature=\"pacg\"\ntarget_feature=\"pan\"\ntarget_feature=\"pmuv3\"\ntarget_feature=\"ras\"\ntarget_feature=\"rcpc\"\ntarget_feature=\"rcpc2\"\ntarget_feature=\"rdm\"\ntarget_feature=\"sb\"\ntarget_feature=\"sha2\"\ntarget_feature=\"sha3\"\ntarget_feature=\"ssbs\"\ntarget_feature=\"vh\"\ntarget_has_atomic=\"128\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"macos\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"apple\"\nunix\n","stderr":""}},"successes":{}}
\ No newline at end of file
+{"rustc_fingerprint":8876508001675379479,"outputs":{"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.89.0 (29483883e 2025-08-04)\nbinary: rustc\ncommit-hash: 29483883eed69d5fb4db01964cdf2af4d86e9cb2\ncommit-date: 2025-08-04\nhost: aarch64-apple-darwin\nrelease: 1.89.0\nLLVM version: 20.1.7\n","stderr":""},"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.dylib\nlib___.dylib\nlib___.a\nlib___.dylib\n/Users/huazhou/.rustup/toolchains/stable-aarch64-apple-darwin\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"aarch64\"\ntarget_endian=\"little\"\ntarget_env=\"\"\ntarget_family=\"unix\"\ntarget_feature=\"aes\"\ntarget_feature=\"crc\"\ntarget_feature=\"dit\"\ntarget_feature=\"dotprod\"\ntarget_feature=\"dpb\"\ntarget_feature=\"dpb2\"\ntarget_feature=\"fcma\"\ntarget_feature=\"fhm\"\ntarget_feature=\"flagm\"\ntarget_feature=\"fp16\"\ntarget_feature=\"frintts\"\ntarget_feature=\"jsconv\"\ntarget_feature=\"lor\"\ntarget_feature=\"lse\"\ntarget_feature=\"neon\"\ntarget_feature=\"paca\"\ntarget_feature=\"pacg\"\ntarget_feature=\"pan\"\ntarget_feature=\"pmuv3\"\ntarget_feature=\"ras\"\ntarget_feature=\"rcpc\"\ntarget_feature=\"rcpc2\"\ntarget_feature=\"rdm\"\ntarget_feature=\"sb\"\ntarget_feature=\"sha2\"\ntarget_feature=\"sha3\"\ntarget_feature=\"ssbs\"\ntarget_feature=\"vh\"\ntarget_has_atomic=\"128\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"macos\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"apple\"\nunix\n","stderr":""}},"successes":{}}
\ No newline at end of file
diff --git a/jive-api/target/release/jive-api b/jive-api/target/release/jive-api
index 5473600b..2834273d 100755
Binary files a/jive-api/target/release/jive-api and b/jive-api/target/release/jive-api differ