diff --git a/.env b/.env
new file mode 100644
index 00000000..a033ac29
--- /dev/null
+++ b/.env
@@ -0,0 +1,3 @@
+HOST=127.0.0.1
+PORT=8000
+DATABASE_URL="postgresql://infiniflow:infiniflow@localhost/docgpt"
\ No newline at end of file
diff --git a/.env.template b/.env.template
new file mode 100644
index 00000000..a033ac29
--- /dev/null
+++ b/.env.template
@@ -0,0 +1,3 @@
+HOST=127.0.0.1
+PORT=8000
+DATABASE_URL="postgresql://infiniflow:infiniflow@localhost/docgpt"
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 1a48c922..da300c87 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@ Cargo.lock
 *.pdb
 
 .idea/
+.env
diff --git a/Cargo.toml b/Cargo.toml
index 779323c7..e27e50d8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,9 +8,15 @@ edition = "2021"
 [dependencies]
 actix-web = "4.3.1"
 actix-rt = "2.8.0"
+actix-files = "0.6.2"
 postgres = "0.19.7"
 sea-orm = {version = "0.12.9", features = ["sqlx-postgres", "runtime-tokio-native-tls", "macros"]}
 serde = { version = "1", features = ["derive"] }
+serde_json = "1.0"
+tracing-subscriber = "0.3.18"
+dotenvy = "0.15.7"
+listenfd = "1.0.1"
+migration = { path = "./migration" }
 
 [[bin]]
 name = "doc_gpt"
diff --git a/migration/README.md b/migration/README.md
index 3b438d89..83c18d5d 100644
--- a/migration/README.md
+++ b/migration/README.md
@@ -1,4 +1,4 @@
-# Running Migrator CLI
+          # Running Migrator CLI
 
 - Generate a new migration file
     ```sh
diff --git a/migration/src/m20220101_000001_create_table.rs b/migration/src/m20220101_000001_create_table.rs
index e2dfd14b..4269fdcf 100644
--- a/migration/src/m20220101_000001_create_table.rs
+++ b/migration/src/m20220101_000001_create_table.rs
@@ -37,12 +37,13 @@ impl MigrationTrait for Migration {
                     .table(TagInfo::Table)
                     .if_not_exists()
                     .col(
-                        ColumnDef::new(TagInfo::Uid)
+                        ColumnDef::new(TagInfo::Tid)
                             .big_integer()
                             .not_null()
                             .auto_increment()
                             .primary_key(),
                     )
+                    .col(ColumnDef::new(TagInfo::Uid).big_integer().not_null())
                     .col(ColumnDef::new(TagInfo::TagName).string().not_null())
                     .col(ColumnDef::new(TagInfo::Regx).string())
                     .col(ColumnDef::new(TagInfo::Color).big_integer().default(1))
@@ -61,8 +62,7 @@ impl MigrationTrait for Migration {
                     .table(Tag2Doc::Table)
                     .if_not_exists()
                     .col(ColumnDef::new(Tag2Doc::TagId).big_integer())
-                    .col(ColumnDef::new(Tag2Doc::Did).big_integer().comment("doc id, did in docinfo"))
-                    .index(Index::create().col(Tag2Doc::TagId))
+                    .col(ColumnDef::new(Tag2Doc::Did).big_integer())
                     .to_owned(),
             )
             .await?;
@@ -73,8 +73,7 @@ impl MigrationTrait for Migration {
                     .table(Kb2Doc::Table)
                     .if_not_exists()
                     .col(ColumnDef::new(Kb2Doc::KbId).big_integer())
-                    .col(ColumnDef::new(Kb2Doc::Did).big_integer().comment("doc id, did in docinfo"))
-                    .index(Index::create().col(Kb2Doc::KbId))
+                    .col(ColumnDef::new(Kb2Doc::Did).big_integer())
                     .to_owned(),
             )
             .await?;
@@ -86,7 +85,6 @@ impl MigrationTrait for Migration {
                     .if_not_exists()
                     .col(ColumnDef::new(Dialog2Kb::DialogId).big_integer())
                     .col(ColumnDef::new(Dialog2Kb::KbId).big_integer())
-                    .index(Index::create().col(Dialog2Kb::DialogId))
                     .to_owned(),
             )
             .await?;
@@ -96,9 +94,8 @@ impl MigrationTrait for Migration {
                 Table::create()
                     .table(Doc2Doc::Table)
                     .if_not_exists()
-                    .col(ColumnDef::new(Doc2Doc::ParentId).big_integer().comment("doc id, did in docinfo"))
-                    .col(ColumnDef::new(Doc2Doc::Did).big_integer().comment("doc id, did in docinfo"))
-                    .index(Index::create().col(Doc2Doc::ParentId))
+                    .col(ColumnDef::new(Doc2Doc::ParentId).big_integer())
+                    .col(ColumnDef::new(Doc2Doc::Did).big_integer())
                     .to_owned(),
             )
             .await?;
@@ -108,15 +105,16 @@ impl MigrationTrait for Migration {
                 Table::create()
                     .table(KbInfo::Table)
                     .if_not_exists()
-                    .col(ColumnDef::new(KbInfo::KbId).big_integer().auto_increment().not_null())
+                    .col(ColumnDef::new(KbInfo::KbId).big_integer()
+                        .auto_increment()
+                        .not_null()
+                        .primary_key())
                     .col(ColumnDef::new(KbInfo::Uid).big_integer().not_null())
                     .col(ColumnDef::new(KbInfo::KbName).string().not_null())
                     .col(ColumnDef::new(KbInfo::Icon).big_integer().default(1))
                     .col(ColumnDef::new(KbInfo::CreatedAt).date().not_null())
                     .col(ColumnDef::new(KbInfo::UpdatedAt).date().not_null())
                     .col(ColumnDef::new(KbInfo::IsDeleted).boolean().default(false))
-                    .index(Index::create().col(KbInfo::KbId))
-                    .index(Index::create().col(KbInfo::Uid))
                     .to_owned(),
             )
             .await?;
@@ -126,7 +124,10 @@ impl MigrationTrait for Migration {
                 Table::create()
                     .table(DocInfo::Table)
                     .if_not_exists()
-                    .col(ColumnDef::new(DocInfo::Did).big_integer().auto_increment().not_null())
+                    .col(ColumnDef::new(DocInfo::Did).big_integer()
+                        .not_null()
+                        .auto_increment()
+                        .primary_key())
                     .col(ColumnDef::new(DocInfo::Uid).big_integer().not_null())
                     .col(ColumnDef::new(DocInfo::DocName).string().not_null())
                     .col(ColumnDef::new(DocInfo::Size).big_integer().not_null())
@@ -135,8 +136,6 @@ impl MigrationTrait for Migration {
                     .col(ColumnDef::new(DocInfo::CreatedAt).date().not_null())
                     .col(ColumnDef::new(DocInfo::UpdatedAt).date().not_null())
                     .col(ColumnDef::new(DocInfo::IsDeleted).boolean().default(false))
-                    .index(Index::create().col(DocInfo::Did))
-                    .index(Index::create().col(DocInfo::Uid))
                     .to_owned(),
             )
             .await?;
@@ -146,15 +145,17 @@ impl MigrationTrait for Migration {
                 Table::create()
                     .table(DialogInfo::Table)
                     .if_not_exists()
-                    .col(ColumnDef::new(DialogInfo::DialogId).big_integer().auto_increment().not_null())
+                    .col(ColumnDef::new(DialogInfo::DialogId)
+                        .big_integer()
+                        .not_null()
+                        .auto_increment()
+                        .primary_key())
                     .col(ColumnDef::new(DialogInfo::Uid).big_integer().not_null())
                     .col(ColumnDef::new(DialogInfo::DialogName).string().not_null())
                     .col(ColumnDef::new(DialogInfo::History).string().comment("json"))
                     .col(ColumnDef::new(DialogInfo::CreatedAt).date().not_null())
                     .col(ColumnDef::new(DialogInfo::UpdatedAt).date().not_null())
                     .col(ColumnDef::new(DialogInfo::IsDeleted).boolean().default(false))
-                    .index(Index::create().col(DialogInfo::DialogId))
-                    .index(Index::create().col(DialogInfo::Uid))
                     .to_owned(),
             )
             .await?;
@@ -221,6 +222,7 @@ enum UserInfo {
 #[derive(DeriveIden)]
 enum TagInfo {
     Table,
+    Tid,
     Uid,
     TagName,
     Regx,
diff --git a/src/api/mod.rs b/src/api/mod.rs
index e69de29b..f8cf91d9 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -0,0 +1,10 @@
+use serde::{Deserialize, Serialize};
+
+pub(crate) mod tag;
+
+#[derive(Debug, Deserialize, Serialize)]
+struct JsonResponse<T> {
+    code: u32,
+    err: String,
+    data: T,
+}
\ No newline at end of file
diff --git a/src/api/tag.rs b/src/api/tag.rs
new file mode 100644
index 00000000..3af8a65a
--- /dev/null
+++ b/src/api/tag.rs
@@ -0,0 +1,58 @@
+use std::collections::HashMap;
+use actix_web::{get, HttpResponse, post, web};
+use actix_web::http::Error;
+use crate::api::JsonResponse;
+use crate::AppState;
+use crate::entity::tag_info;
+use crate::service::tag_info::{Mutation, Query};
+
+#[post("/v1.0/create_tag")]
+async fn create(model: web::Json<tag_info::Model>, data: web::Data<AppState>) -> Result<HttpResponse, Error> {
+    let model = Mutation::create_tag(&data.conn, model.into_inner()).await.unwrap();
+
+    let mut result = HashMap::new();
+    result.insert("tid", model.uid.unwrap());
+
+    let json_response = JsonResponse {
+        code: 200,
+        err: "".to_owned(),
+        data: result,
+    };
+
+    Ok(HttpResponse::Ok()
+        .content_type("application/json")
+        .body(serde_json::to_string(&json_response).unwrap()))
+}
+
+#[post("/v1.0/delete_tag")]
+async fn delete(model: web::Json<tag_info::Model>, data: web::Data<AppState>) -> Result<HttpResponse, Error> {
+    let _ = Mutation::delete_tag(&data.conn, model.tid).await.unwrap();
+
+    let json_response = JsonResponse {
+        code: 200,
+        err: "".to_owned(),
+        data: (),
+    };
+
+    Ok(HttpResponse::Ok()
+        .content_type("application/json")
+        .body(serde_json::to_string(&json_response).unwrap()))
+}
+
+#[get("/v1.0/tags")]
+async fn list(data: web::Data<AppState>) -> Result<HttpResponse, Error> {
+    let tags = Query::find_tag_infos(&data.conn).await.unwrap();
+
+    let mut result = HashMap::new();
+    result.insert("tags", tags);
+
+    let json_response = JsonResponse {
+        code: 200,
+        err: "".to_owned(),
+        data: result,
+    };
+
+    Ok(HttpResponse::Ok()
+        .content_type("application/json")
+        .body(serde_json::to_string(&json_response).unwrap()))
+}
\ No newline at end of file
diff --git a/src/entity/dialog_2_kb.rs b/src/entity/dialog2_kb.rs
similarity index 94%
rename from src/entity/dialog_2_kb.rs
rename to src/entity/dialog2_kb.rs
index c4cbf734..18420f9e 100644
--- a/src/entity/dialog_2_kb.rs
+++ b/src/entity/dialog2_kb.rs
@@ -2,9 +2,10 @@ use sea_orm::entity::prelude::*;
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel, Deserialize, Serialize)]
-#[sea_orm(table_name = "dialog_2_kb")]
+#[sea_orm(table_name = "dialog2_kb")]
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(index)]
     pub dialog_id: i64,
     #[sea_orm(primary_key, auto_increment = false)]
     pub kb_id: i64,
diff --git a/src/entity/dialog_info.rs b/src/entity/dialog_info.rs
index d426b957..d0c49359 100644
--- a/src/entity/dialog_info.rs
+++ b/src/entity/dialog_info.rs
@@ -6,15 +6,13 @@ use serde::{Deserialize, Serialize};
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
     pub dialog_id: i64,
-    #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(index)]
     pub uid: i64,
     pub dialog_name: String,
     pub history: String,
 
-    pub created_at: DateTimeWithTimeZone,
-    pub updated_at: DateTimeWithTimeZone,
-    #[sea_orm(soft_delete_column)]
-    pub is_deleted: bool,
+    pub created_at: Date,
+    pub updated_at: Date,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
@@ -22,11 +20,11 @@ pub enum Relation {}
 
 impl Related<super::kb_info::Entity> for Entity {
     fn to() -> RelationDef {
-        super::dialog_2_kb::Relation::KbInfo.def()
+        super::dialog2_kb::Relation::KbInfo.def()
     }
 
     fn via() -> Option<RelationDef> {
-        Some(super::dialog_2_kb::Relation::DialogInfo.def().rev())
+        Some(super::dialog2_kb::Relation::DialogInfo.def().rev())
     }
 }
 
diff --git a/src/entity/doc_2_doc.rs b/src/entity/doc2_doc.rs
similarity index 94%
rename from src/entity/doc_2_doc.rs
rename to src/entity/doc2_doc.rs
index a1c0b459..f987a2d5 100644
--- a/src/entity/doc_2_doc.rs
+++ b/src/entity/doc2_doc.rs
@@ -2,9 +2,10 @@ use sea_orm::entity::prelude::*;
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel, Deserialize, Serialize)]
-#[sea_orm(table_name = "doc_2_doc")]
+#[sea_orm(table_name = "doc2_doc")]
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(index)]
     pub parent_id: i64,
     #[sea_orm(primary_key, auto_increment = false)]
     pub did: i64,
diff --git a/src/entity/doc_info.rs b/src/entity/doc_info.rs
index f7c9ae43..4e5641b2 100644
--- a/src/entity/doc_info.rs
+++ b/src/entity/doc_info.rs
@@ -6,7 +6,7 @@ use serde::{Deserialize, Serialize};
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
     pub did: i64,
-    #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(index)]
     pub uid: i64,
     pub doc_name: String,
     pub size: i64,
@@ -14,8 +14,8 @@ pub struct Model {
     pub r#type: String,
     pub kb_progress: f64,
 
-    pub created_at: DateTimeWithTimeZone,
-    pub updated_at: DateTimeWithTimeZone,
+    pub created_at: Date,
+    pub updated_at: Date,
     #[sea_orm(soft_delete_column)]
     pub is_deleted: bool,
 }
@@ -25,31 +25,31 @@ pub enum Relation {}
 
 impl Related<super::tag_info::Entity> for Entity {
     fn to() -> RelationDef {
-        super::tag_2_doc::Relation::Tag.def()
+        super::tag2_doc::Relation::Tag.def()
     }
 
     fn via() -> Option<RelationDef> {
-        Some(super::tag_2_doc::Relation::DocInfo.def().rev())
+        Some(super::tag2_doc::Relation::DocInfo.def().rev())
     }
 }
 
 impl Related<super::kb_info::Entity> for Entity {
     fn to() -> RelationDef {
-        super::kb_2_doc::Relation::KbInfo.def()
+        super::kb2_doc::Relation::KbInfo.def()
     }
 
     fn via() -> Option<RelationDef> {
-        Some(super::kb_2_doc::Relation::DocInfo.def().rev())
+        Some(super::kb2_doc::Relation::DocInfo.def().rev())
     }
 }
 
 impl Related<Entity> for Entity {
     fn to() -> RelationDef {
-        super::doc_2_doc::Relation::Parent.def()
+        super::doc2_doc::Relation::Parent.def()
     }
 
     fn via() -> Option<RelationDef> {
-        Some(super::doc_2_doc::Relation::Child.def().rev())
+        Some(super::doc2_doc::Relation::Child.def().rev())
     }
 }
 
diff --git a/src/entity/kb_2_doc.rs b/src/entity/kb2_doc.rs
similarity index 94%
rename from src/entity/kb_2_doc.rs
rename to src/entity/kb2_doc.rs
index a6406e3f..f9d92343 100644
--- a/src/entity/kb_2_doc.rs
+++ b/src/entity/kb2_doc.rs
@@ -2,9 +2,10 @@ use sea_orm::entity::prelude::*;
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel, Deserialize, Serialize)]
-#[sea_orm(table_name = "kb_2_doc")]
+#[sea_orm(table_name = "kb2_doc")]
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(index)]
     pub kb_id: i64,
     #[sea_orm(primary_key, auto_increment = false)]
     pub uid: i64,
diff --git a/src/entity/kb_info.rs b/src/entity/kb_info.rs
index 1ad16698..11cb3b2c 100644
--- a/src/entity/kb_info.rs
+++ b/src/entity/kb_info.rs
@@ -6,15 +6,13 @@ use serde::{Deserialize, Serialize};
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
     pub kb_id: i64,
-    #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(index)]
     pub uid: i64,
     pub kn_name: String,
     pub icon: i64,
 
-    pub created_at: DateTimeWithTimeZone,
-    pub updated_at: DateTimeWithTimeZone,
-    #[sea_orm(soft_delete_column)]
-    pub is_deleted: bool,
+    pub created_at: Date,
+    pub updated_at: Date,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
@@ -22,21 +20,21 @@ pub enum Relation {}
 
 impl Related<super::doc_info::Entity> for Entity {
     fn to() -> RelationDef {
-        super::kb_2_doc::Relation::DocInfo.def()
+        super::kb2_doc::Relation::DocInfo.def()
     }
 
     fn via() -> Option<RelationDef> {
-        Some(super::kb_2_doc::Relation::KbInfo.def().rev())
+        Some(super::kb2_doc::Relation::KbInfo.def().rev())
     }
 }
 
 impl Related<super::dialog_info::Entity> for Entity {
     fn to() -> RelationDef {
-        super::dialog_2_kb::Relation::DialogInfo.def()
+        super::dialog2_kb::Relation::DialogInfo.def()
     }
 
     fn via() -> Option<RelationDef> {
-        Some(super::dialog_2_kb::Relation::KbInfo.def().rev())
+        Some(super::dialog2_kb::Relation::KbInfo.def().rev())
     }
 }
 
diff --git a/src/entity/mod.rs b/src/entity/mod.rs
index 4189e394..bc48fdc1 100644
--- a/src/entity/mod.rs
+++ b/src/entity/mod.rs
@@ -1,9 +1,9 @@
-mod user_info;
-mod tag_info;
-mod tag_2_doc;
-mod kb_2_doc;
-mod dialog_2_kb;
-mod doc_2_doc;
-mod kb_info;
-mod doc_info;
-mod dialog_info;
\ No newline at end of file
+pub(crate) mod user_info;
+pub(crate) mod tag_info;
+mod tag2_doc;
+mod kb2_doc;
+mod dialog2_kb;
+mod doc2_doc;
+pub(crate) mod kb_info;
+pub(crate) mod doc_info;
+pub(crate) mod dialog_info;
\ No newline at end of file
diff --git a/src/entity/tag_2_doc.rs b/src/entity/tag2_doc.rs
similarity index 89%
rename from src/entity/tag_2_doc.rs
rename to src/entity/tag2_doc.rs
index 5dba1771..61453c4f 100644
--- a/src/entity/tag_2_doc.rs
+++ b/src/entity/tag2_doc.rs
@@ -2,9 +2,10 @@ use sea_orm::entity::prelude::*;
 use serde::{Deserialize, Serialize};
 
 #[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel, Deserialize, Serialize)]
-#[sea_orm(table_name = "tag_2_doc")]
+#[sea_orm(table_name = "tag2_doc")]
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(index)]
     pub tag_id: i64,
     #[sea_orm(primary_key, auto_increment = false)]
     pub uid: i64,
@@ -25,7 +26,7 @@ impl RelationTrait for Relation {
                 .into(),
             Self::Tag => Entity::belongs_to(super::tag_info::Entity)
                 .from(Column::TagId)
-                .to(super::tag_info::Column::Uid)
+                .to(super::tag_info::Column::Tid)
                 .into(),
         }
     }
diff --git a/src/entity/tag_info.rs b/src/entity/tag_info.rs
index 4aacddb8..230ed855 100644
--- a/src/entity/tag_info.rs
+++ b/src/entity/tag_info.rs
@@ -6,6 +6,7 @@ use serde::{Deserialize, Serialize};
 pub struct Model {
     #[sea_orm(primary_key)]
     #[serde(skip_deserializing)]
+    pub tid: i64,
     pub uid: i64,
     pub tag_name: String,
     pub regx: String,
@@ -13,10 +14,8 @@ pub struct Model {
     pub icon: i64,
     pub dir: String,
 
-    pub created_at: DateTimeWithTimeZone,
-    pub updated_at: DateTimeWithTimeZone,
-    #[sea_orm(soft_delete_column)]
-    pub is_deleted: bool,
+    pub created_at: Date,
+    pub updated_at: Date,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
@@ -24,11 +23,11 @@ pub enum Relation {}
 
 impl Related<super::doc_info::Entity> for Entity {
     fn to() -> RelationDef {
-        super::tag_2_doc::Relation::DocInfo.def()
+        super::tag2_doc::Relation::DocInfo.def()
     }
 
     fn via() -> Option<RelationDef> {
-        Some(super::tag_2_doc::Relation::Tag.def().rev())
+        Some(super::tag2_doc::Relation::Tag.def().rev())
     }
 }
 
diff --git a/src/entity/user_info.rs b/src/entity/user_info.rs
index d791c08b..464d33e6 100644
--- a/src/entity/user_info.rs
+++ b/src/entity/user_info.rs
@@ -16,8 +16,6 @@ pub struct Model {
 
     pub created_at: DateTimeWithTimeZone,
     pub updated_at: DateTimeWithTimeZone,
-    #[sea_orm(soft_delete_column)]
-    pub is_deleted: bool,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
diff --git a/src/main.rs b/src/main.rs
index 6ef93cea..25757443 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,22 +2,60 @@ mod api;
 mod entity;
 mod service;
 
-use actix_web::{get, web, App, HttpServer, Responder};
+use std::env;
+use actix_files::Files;
+use actix_web::{web, App, HttpServer, middleware};
+use listenfd::ListenFd;
+use sea_orm::{Database, DatabaseConnection};
+use migration::{Migrator, MigratorTrait};
 
-#[get("/")]
-async fn index() -> impl Responder {
-    "Hello, World!"
-}
-
-#[get("/{name}")]
-async fn hello(name: web::Path<String>) -> impl Responder {
-    format!("Hello {}!", &name)
+#[derive(Debug, Clone)]
+struct AppState {
+    conn: DatabaseConnection,
 }
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    HttpServer::new(|| App::new().service(index).service(hello))
-        .bind(("127.0.0.1", 9090))?
-        .run()
-        .await
+    std::env::set_var("RUST_LOG", "debug");
+    tracing_subscriber::fmt::init();
+
+    // get env vars
+    dotenvy::dotenv().ok();
+    let db_url = env::var("DATABASE_URL").expect("DATABASE_URL is not set in .env file");
+    let host = env::var("HOST").expect("HOST is not set in .env file");
+    let port = env::var("PORT").expect("PORT is not set in .env file");
+    let server_url = format!("{host}:{port}");
+
+    // establish connection to database and apply migrations
+    // -> create post table if not exists
+    let conn = Database::connect(&db_url).await.unwrap();
+    Migrator::up(&conn, None).await.unwrap();
+
+    let state = AppState { conn };
+
+    // create server and try to serve over socket if possible
+    let mut listenfd = ListenFd::from_env();
+    let mut server = HttpServer::new(move || {
+        App::new()
+            .service(Files::new("/static", "./static"))
+            .app_data(web::Data::new(state.clone()))
+            .wrap(middleware::Logger::default())
+            .configure(init)
+    });
+
+    server = match listenfd.take_tcp_listener(0)? {
+        Some(listener) => server.listen(listener)?,
+        None => server.bind(&server_url)?,
+    };
+
+    println!("Starting server at {server_url}");
+    server.run().await?;
+
+    Ok(())
+}
+
+fn init(cfg: &mut web::ServiceConfig) {
+    cfg.service(api::tag::create);
+    cfg.service(api::tag::delete);
+    cfg.service(api::tag::list);
 }
\ No newline at end of file
diff --git a/src/service/dialog_info.rs b/src/service/dialog_info.rs
new file mode 100644
index 00000000..b2f9f9d3
--- /dev/null
+++ b/src/service/dialog_info.rs
@@ -0,0 +1,26 @@
+use sea_orm::{DbConn, DbErr, EntityTrait, PaginatorTrait, QueryOrder};
+use crate::entity::dialog_info;
+use crate::entity::dialog_info::Entity;
+
+pub struct Query;
+
+impl Query {
+    pub async fn find_dialog_info_by_id(db: &DbConn, id: i64) -> Result<Option<dialog_info::Model>, DbErr> {
+        Entity::find_by_id(id).one(db).await
+    }
+
+    pub async fn find_dialog_infos_in_page(
+        db: &DbConn,
+        page: u64,
+        posts_per_page: u64,
+    ) -> Result<(Vec<dialog_info::Model>, u64), DbErr> {
+        // Setup paginator
+        let paginator = Entity::find()
+            .order_by_asc(dialog_info::Column::DialogId)
+            .paginate(db, posts_per_page);
+        let num_pages = paginator.num_pages().await?;
+
+        // Fetch paginated posts
+        paginator.fetch_page(page - 1).await.map(|p| (p, num_pages))
+    }
+}
\ No newline at end of file
diff --git a/src/service/mod.rs b/src/service/mod.rs
index e69de29b..ceecbc1b 100644
--- a/src/service/mod.rs
+++ b/src/service/mod.rs
@@ -0,0 +1,2 @@
+pub(crate) mod dialog_info;
+pub(crate) mod tag_info;
\ No newline at end of file
diff --git a/src/service/tag_info.rs b/src/service/tag_info.rs
new file mode 100644
index 00000000..c0a3ce77
--- /dev/null
+++ b/src/service/tag_info.rs
@@ -0,0 +1,94 @@
+use sea_orm::{ActiveModelTrait, DbConn, DbErr, DeleteResult, EntityTrait, PaginatorTrait, QueryOrder};
+use sea_orm::ActiveValue::Set;
+use crate::entity::tag_info;
+use crate::entity::tag_info::Entity;
+
+pub struct Query;
+
+impl Query {
+    pub async fn find_tag_info_by_id(db: &DbConn, id: i64) -> Result<Option<tag_info::Model>, DbErr> {
+        Entity::find_by_id(id).one(db).await
+    }
+
+    pub async fn find_tag_infos(db: &DbConn) -> Result<Vec<tag_info::Model>, DbErr> {
+        Entity::find().all(db).await
+    }
+
+    pub async fn find_tag_infos_in_page(
+        db: &DbConn,
+        page: u64,
+        posts_per_page: u64,
+    ) -> Result<(Vec<tag_info::Model>, u64), DbErr> {
+        // Setup paginator
+        let paginator = Entity::find()
+            .order_by_asc(tag_info::Column::Uid)
+            .paginate(db, posts_per_page);
+        let num_pages = paginator.num_pages().await?;
+
+        // Fetch paginated posts
+        paginator.fetch_page(page - 1).await.map(|p| (p, num_pages))
+    }
+}
+
+pub struct Mutation;
+
+impl Mutation {
+    pub async fn create_tag(
+        db: &DbConn,
+        form_data: tag_info::Model,
+    ) -> Result<tag_info::ActiveModel, DbErr> {
+        tag_info::ActiveModel {
+            tid: Set(form_data.tid.to_owned()),
+            uid: Set(form_data.uid.to_owned()),
+            tag_name: Set(form_data.tag_name.to_owned()),
+            regx: Set(form_data.regx.to_owned()),
+            color: Set(form_data.color.to_owned()),
+            icon: Set(form_data.icon.to_owned()),
+            dir: Set(form_data.dir.to_owned()),
+            created_at: Default::default(),
+            updated_at: Default::default(),
+        }
+            .save(db)
+            .await
+    }
+
+    pub async fn update_tag_by_id(
+        db: &DbConn,
+        id: i64,
+        form_data: tag_info::Model,
+    ) -> Result<tag_info::Model, DbErr> {
+        let tag: tag_info::ActiveModel = Entity::find_by_id(id)
+            .one(db)
+            .await?
+            .ok_or(DbErr::Custom("Cannot find post.".to_owned()))
+            .map(Into::into)?;
+
+        tag_info::ActiveModel {
+            tid: tag.tid,
+            uid: tag.uid,
+            tag_name: Set(form_data.tag_name.to_owned()),
+            regx: Set(form_data.regx.to_owned()),
+            color: Set(form_data.color.to_owned()),
+            icon: Set(form_data.icon.to_owned()),
+            dir: Set(form_data.dir.to_owned()),
+            created_at: Default::default(),
+            updated_at: Default::default(),
+        }
+            .update(db)
+            .await
+    }
+
+    pub async fn delete_tag(db: &DbConn, tid: i64) -> Result<DeleteResult, DbErr> {
+        let tag: tag_info::ActiveModel = Entity::find_by_id(tid)
+            .one(db)
+            .await?
+            .ok_or(DbErr::Custom("Cannot find tag.".to_owned()))
+            .map(Into::into)?;
+
+        tag.delete(db).await
+    }
+
+    pub async fn delete_all_tags(db: &DbConn) -> Result<DeleteResult, DbErr> {
+        Entity::delete_many().exec(db).await
+    }
+}
\ No newline at end of file