diff --git a/Cargo.lock b/Cargo.lock
index e2ec820..f6a7357 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -113,6 +113,18 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "argon2"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c3610892ee6e0cbce8ae2700349fcf8f98adb0dbfbee85aec3c9179d29cc072"
+dependencies = [
+ "base64ct",
+ "blake2",
+ "cpufeatures",
+ "password-hash",
+]
+
 [[package]]
 name = "ascii_utils"
 version = "0.9.3"
@@ -463,6 +475,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "blake2"
+version = "0.10.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "46502ad458c9a52b69d4d4d32775c788b7a1b85e8bc9d482d92250fc0e3f8efe"
+dependencies = [
+ "digest",
+]
+
 [[package]]
 name = "block-buffer"
 version = "0.10.4"
@@ -817,8 +838,8 @@ dependencies = [
  "chrono",
  "chrono-tz",
  "clap",
+ "csv",
  "dotenv",
- "dpts-entity",
  "dpts-migration",
  "iana-time-zone",
  "log",
@@ -829,32 +850,6 @@ dependencies = [
  "toml",
 ]
 
-[[package]]
-name = "dpts-csv"
-version = "0.1.0"
-dependencies = [
- "chrono",
- "csv",
- "dpts-entity",
- "serde",
- "thiserror 2.0.12",
-]
-
-[[package]]
-name = "dpts-entity"
-version = "0.1.0"
-dependencies = [
- "async-graphql",
- "axum",
- "chrono",
- "dotenv",
- "dpts-migration",
- "log",
- "sea-orm",
- "serde",
- "tokio",
-]
-
 [[package]]
 name = "dpts-migration"
 version = "0.1.0"
@@ -867,10 +862,12 @@ dependencies = [
 name = "dpts-server"
 version = "0.1.0"
 dependencies = [
+ "argon2",
  "axum",
  "chrono",
  "clap",
  "dpts-core",
+ "rand 0.9.1",
  "serde",
  "thiserror 2.0.12",
  "tokio",
@@ -1745,7 +1742,7 @@ dependencies = [
  "num-integer",
  "num-iter",
  "num-traits",
- "rand",
+ "rand 0.8.5",
  "smallvec",
  "zeroize",
 ]
@@ -1910,6 +1907,17 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "password-hash"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "346f04948ba92c43e8469c1ee6736c7563d71012b17d40745260fe106aac2166"
+dependencies = [
+ "base64ct",
+ "rand_core 0.6.4",
+ "subtle",
+]
+
 [[package]]
 name = "pem-rfc7468"
 version = "0.7.0"
@@ -1996,7 +2004,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c80231409c20246a13fddb31776fb942c38553c51e871f8cbd687a4cfb5843d"
 dependencies = [
  "phf_shared",
- "rand",
+ "rand 0.8.5",
 ]
 
 [[package]]
@@ -2157,8 +2165,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
  "libc",
- "rand_chacha",
- "rand_core",
+ "rand_chacha 0.3.1",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9fbfd9d094a40bf3ae768db9361049ace4c0e04a4fd6b359518bd7b73a73dd97"
+dependencies = [
+ "rand_chacha 0.9.0",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -2168,7 +2186,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.6.4",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
+dependencies = [
+ "ppv-lite86",
+ "rand_core 0.9.3",
 ]
 
 [[package]]
@@ -2180,6 +2208,15 @@ dependencies = [
  "getrandom 0.2.16",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99d9a13982dcf210057a8a78572b2217b667c3beacbf3a0d8b454f6f82837d38"
+dependencies = [
+ "getrandom 0.3.2",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.5.11"
@@ -2260,7 +2297,7 @@ dependencies = [
  "num-traits",
  "pkcs1",
  "pkcs8",
- "rand_core",
+ "rand_core 0.6.4",
  "signature",
  "spki",
  "subtle",
@@ -2630,7 +2667,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77549399552de45a898a580c1b41d445bf730df867cc44e6c0233bbc4b8329de"
 dependencies = [
  "digest",
- "rand_core",
+ "rand_core 0.6.4",
 ]
 
 [[package]]
@@ -2806,7 +2843,7 @@ dependencies = [
  "memchr",
  "once_cell",
  "percent-encoding",
- "rand",
+ "rand 0.8.5",
  "rsa",
  "serde",
  "sha1",
@@ -2845,7 +2882,7 @@ dependencies = [
  "md-5",
  "memchr",
  "once_cell",
- "rand",
+ "rand 0.8.5",
  "serde",
  "serde_json",
  "sha2",
diff --git a/Cargo.toml b/Cargo.toml
index 334acbc..91ff2f7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,13 +2,12 @@
 members = ["dpts-*"]
 
 [workspace.dependencies]
+async-graphql = { version = "7.0", features = ["chrono"] }
 dpts-cli.path = "dpts-cli"
 dpts-client.path = "dpts-client"
 dpts-core = { path = "dpts-core" }
-dpts-csv = { path = "dpts-csv" }
-dpts-entity = { path = "dpts-entity" }
 dpts-migration = {path = "dpts-migration"}
-dpts-server.path = "dpts-server"
+dpts-server = { path = "dpts-server" }
 chrono = {version = "0.4", features = ["serde"]}
 chrono-tz = {version = "0.10.3", features = ["serde"]}
 clap = {version = "4.5", features = ["derive"]}
diff --git a/dpts-core/Cargo.toml b/dpts-core/Cargo.toml
index 37cf38f..1220be9 100644
--- a/dpts-core/Cargo.toml
+++ b/dpts-core/Cargo.toml
@@ -10,13 +10,13 @@ default = ["clap",]
 clap = ["dep:clap"]
 
 [dependencies]
-async-graphql = { version = "7.0", features = ["chrono"] }
+async-graphql.workspace = true
 axum = "0.8"
 chrono = {workspace = true}
 chrono-tz.workspace = true
 clap = { workspace = true, optional = true }
+csv = "1.3.1"
 dotenv = {workspace = true}
-dpts-entity = { workspace = true }
 dpts-migration = { workspace = true }
 iana-time-zone = "0.1.63"
 log = "0.4.27"
diff --git a/dpts-csv/src/error.rs b/dpts-core/src/csv/error.rs
similarity index 100%
rename from dpts-csv/src/error.rs
rename to dpts-core/src/csv/error.rs
diff --git a/dpts-csv/src/lib.rs b/dpts-core/src/csv/mod.rs
similarity index 100%
rename from dpts-csv/src/lib.rs
rename to dpts-core/src/csv/mod.rs
diff --git a/dpts-csv/src/reader.rs b/dpts-core/src/csv/reader.rs
similarity index 100%
rename from dpts-csv/src/reader.rs
rename to dpts-core/src/csv/reader.rs
diff --git a/dpts-csv/src/record.rs b/dpts-core/src/csv/record.rs
similarity index 87%
rename from dpts-csv/src/record.rs
rename to dpts-core/src/csv/record.rs
index 243fc1d..d7d4176 100644
--- a/dpts-csv/src/record.rs
+++ b/dpts-core/src/csv/record.rs
@@ -1,7 +1,9 @@
 use chrono::{DateTime, NaiveDateTime};
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
-use dpts_entity::RecordDetailModel;
-use crate::error::Error;
+use crate::{
+    entity::RecordDetailModel,
+    error::Error,
+};
 
 #[derive(Debug, Deserialize, PartialEq, Serialize)]
 pub struct CsvRecord{
diff --git a/dpts-csv/src/table.rs b/dpts-core/src/csv/table.rs
similarity index 100%
rename from dpts-csv/src/table.rs
rename to dpts-core/src/csv/table.rs
diff --git a/dpts-csv/src/writer.rs b/dpts-core/src/csv/writer.rs
similarity index 100%
rename from dpts-csv/src/writer.rs
rename to dpts-core/src/csv/writer.rs
diff --git a/dpts-core/src/database_connection.rs b/dpts-core/src/database_connection.rs
index faadcf3..283f751 100644
--- a/dpts-core/src/database_connection.rs
+++ b/dpts-core/src/database_connection.rs
@@ -72,7 +72,7 @@ mod tests {
     use chrono::{offset, FixedOffset, Local, TimeZone};
     use sea_orm::{entity::*, query::*, ConnectOptions, Database};
     use dpts_migration::{Migrator, MigratorTrait};
-    use dpts_entity::*;
+    use crate::entity::*;
 
     #[tokio::test]
     async fn check_database_connection() {
diff --git a/dpts-entity/src/lib.rs b/dpts-core/src/entity/mod.rs
similarity index 100%
rename from dpts-entity/src/lib.rs
rename to dpts-core/src/entity/mod.rs
diff --git a/dpts-entity/src/record_detail.rs b/dpts-core/src/entity/record_detail.rs
similarity index 100%
rename from dpts-entity/src/record_detail.rs
rename to dpts-core/src/entity/record_detail.rs
diff --git a/dpts-entity/src/record_header.rs b/dpts-core/src/entity/record_header.rs
similarity index 100%
rename from dpts-entity/src/record_header.rs
rename to dpts-core/src/entity/record_header.rs
diff --git a/dpts-entity/src/record_tag.rs b/dpts-core/src/entity/record_tag.rs
similarity index 100%
rename from dpts-entity/src/record_tag.rs
rename to dpts-core/src/entity/record_tag.rs
diff --git a/dpts-entity/src/user.rs b/dpts-core/src/entity/user.rs
similarity index 71%
rename from dpts-entity/src/user.rs
rename to dpts-core/src/entity/user.rs
index 4b0cc0a..d407125 100644
--- a/dpts-entity/src/user.rs
+++ b/dpts-core/src/entity/user.rs
@@ -1,11 +1,9 @@
-use async_graphql::*;
 use chrono::{DateTime, FixedOffset,};
 use sea_orm::entity::prelude::*;
 use serde::{Deserialize, Serialize};
 
-#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize, SimpleObject)]
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
 #[sea_orm(table_name = "user")]
-#[graphql(concrete(name = "User", params()))]
 pub struct Model {
     #[sea_orm(primary_key)]
     #[serde(skip_deserializing)]
@@ -17,6 +15,22 @@ pub struct Model {
     pub updated_at: DateTimeWithTimeZone,
 }
 
+#[async_graphql::Object]
+impl Model {
+    pub async fn id(&self) -> i32 {
+        self.id
+    }
+    pub async fn login_name(&self) -> String {
+        self.login_name.clone()
+    }
+    pub async fn created_at(&self) -> DateTimeWithTimeZone {
+        self.created_at.clone()
+    }
+    pub async fn updated_at(&self) -> DateTimeWithTimeZone {
+        self.updated_at.clone()
+    }
+}
+
 #[derive(Copy, Clone, Debug, DeriveRelation, EnumIter)]
 pub enum Relation {
     #[sea_orm(has_many = "super::record_header::Entity")]
diff --git a/dpts-core/src/graphql/mod.rs b/dpts-core/src/graphql/mod.rs
index dcf634e..1e303c7 100644
--- a/dpts-core/src/graphql/mod.rs
+++ b/dpts-core/src/graphql/mod.rs
@@ -1,6 +1,6 @@
+mod mutation;
 mod query;
-
-mod response;
-
-//pub use query::GraphqlQuery;
-//pub use response::GraphqlResponse;
\ No newline at end of file
+mod record_detail;
+mod record_header;
+mod record_tag;
+mod user;
\ No newline at end of file
diff --git a/dpts-core/src/graphql/response.rs b/dpts-core/src/graphql/mutation.rs
similarity index 100%
rename from dpts-core/src/graphql/response.rs
rename to dpts-core/src/graphql/mutation.rs
diff --git a/dpts-core/src/graphql/query.rs b/dpts-core/src/graphql/query.rs
index e69de29..181acfa 100644
--- a/dpts-core/src/graphql/query.rs
+++ b/dpts-core/src/graphql/query.rs
@@ -0,0 +1,10 @@
+use async_graphql::*;
+use super::user::UserObject;
+struct Query;
+
+#[Object]
+impl Query {
+    async fn user(&self, username: String) -> Result<Option<UserObject>> {
+        todo!()
+    }
+}
\ No newline at end of file
diff --git a/dpts-core/src/graphql/record_detail.rs b/dpts-core/src/graphql/record_detail.rs
new file mode 100644
index 0000000..e69de29
diff --git a/dpts-core/src/graphql/record_header.rs b/dpts-core/src/graphql/record_header.rs
new file mode 100644
index 0000000..e69de29
diff --git a/dpts-core/src/graphql/record_tag.rs b/dpts-core/src/graphql/record_tag.rs
new file mode 100644
index 0000000..e69de29
diff --git a/dpts-core/src/graphql/user.rs b/dpts-core/src/graphql/user.rs
new file mode 100644
index 0000000..a98d30e
--- /dev/null
+++ b/dpts-core/src/graphql/user.rs
@@ -0,0 +1,27 @@
+use async_graphql::*;
+use chrono::{DateTime, FixedOffset};
+
+
+pub struct UserObject {
+    pub id: i32,
+    pub login_name: Option<String>,
+    pub created_at: Option<DateTime<FixedOffset>>,
+    pub updated_at: Option<DateTime<FixedOffset>>,
+}
+
+#[Object]
+impl UserObject {
+    async fn id(&self) -> i32 {
+        todo!()
+    }
+    async fn login_name(&self) -> Option<String> {
+        todo!()
+    }
+    async fn created_at(&self) -> Option<DateTime<FixedOffset>> {
+        todo!()
+    }
+    async fn updated_at(&self) -> Option<DateTime<FixedOffset>> {
+        todo!()
+    }
+}
+
diff --git a/dpts-core/src/lib.rs b/dpts-core/src/lib.rs
index cacf350..5e573e2 100644
--- a/dpts-core/src/lib.rs
+++ b/dpts-core/src/lib.rs
@@ -1,7 +1,9 @@
 pub mod config;
-mod database_connection;
+pub mod csv;
+pub mod database_connection;
+pub mod entity;
 pub mod error;
-mod graphql;
+pub mod graphql;
 
 pub use database_connection::*;
 pub use error::Error;
diff --git a/dpts-csv/Cargo.toml b/dpts-csv/Cargo.toml
deleted file mode 100644
index d1b6526..0000000
--- a/dpts-csv/Cargo.toml
+++ /dev/null
@@ -1,13 +0,0 @@
-[package]
-name = "dpts-csv"
-version.workspace = true
-edition.workspace = true
-license.workspace = true
-repository.workspace = true
-
-[dependencies]
-dpts-entity = { workspace = true }
-chrono = { workspace = true }
-serde = { workspace = true }
-csv = "1.3.1"
-thiserror.workspace = true
diff --git a/dpts-entity/Cargo.toml b/dpts-entity/Cargo.toml
deleted file mode 100644
index 7531405..0000000
--- a/dpts-entity/Cargo.toml
+++ /dev/null
@@ -1,27 +0,0 @@
-[package]
-name = "dpts-entity"
-version.workspace = true
-edition.workspace = true
-license.workspace = true
-repository.workspace = true
-
-[dependencies]
-dpts-migration = { workspace = true }
-async-graphql = {version = "7.0", features = ["chrono"]}
-axum = "0.8"
-chrono = {workspace = true}
-dotenv = {workspace = true}
-log = "0.4.27"
-serde = { workspace = true }
-tokio = "1.44.2"
-
-[dependencies.sea-orm]
-version = "1.1"
-features = [
-    "macros",
-    "debug-print",
-    "runtime-tokio-native-tls",
-    "sqlx-sqlite",
-    "with-chrono",
-]
-default-features = false
\ No newline at end of file