diff --git a/Cargo.lock b/Cargo.lock
index c5371e3..a3e3470 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -14,6 +14,17 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.18"
@@ -485,6 +496,18 @@ version = "0.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
+[[package]]
+name = "fallible-iterator"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4443176a9f2c162692bd3d352d745ef9413eec5782a80d8fd6f8a1ac692a07f7"
+
+[[package]]
+name = "fallible-streaming-iterator"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7360491ce676a36bf9bb3c56c1aa791658183a54d2744120f27285738d90465a"
+
 [[package]]
 name = "fancy-regex"
 version = "0.10.0"
@@ -621,6 +644,17 @@ dependencies = [
  "unicode-width",
 ]
 
+[[package]]
+name = "getrandom"
+version = "0.2.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
+dependencies = [
+ "cfg-if 1.0.0",
+ "libc",
+ "wasi 0.11.0+wasi-snapshot-preview1",
+]
+
 [[package]]
 name = "gettext"
 version = "0.4.0"
@@ -661,6 +695,18 @@ name = "hashbrown"
 version = "0.12.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "607c8a29735385251a339424dd462993c0fed8fa09d378f259377df08c126022"
+dependencies = [
+ "ahash",
+]
+
+[[package]]
+name = "hashlink"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d452c155cb93fecdfb02a73dd57b5d8e442c2063bd7aac72f1bc5e4263a43086"
+dependencies = [
+ "hashbrown",
+]
 
 [[package]]
 name = "hermit-abi"
@@ -909,6 +955,17 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "libsqlite3-sys"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8664486da51de68fbb3331d37c2a0fff4b60e988f284670a6a0833a8e6406ad"
+dependencies = [
+ "cc",
+ "pkg-config",
+ "vcpkg",
+]
+
 [[package]]
 name = "link-cplusplus"
 version = "1.0.6"
@@ -1301,6 +1358,7 @@ dependencies = [
  "proc_macros",
  "regex",
  "reqwest",
+ "rusqlite",
  "tokio",
  "url",
  "urlparse",
@@ -1448,6 +1506,21 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "rusqlite"
+version = "0.28.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01e213bc3ecb39ac32e81e51ebe31fd888a940515173e3a18a35f8c6e896422a"
+dependencies = [
+ "bitflags",
+ "chrono",
+ "fallible-iterator",
+ "fallible-streaming-iterator",
+ "hashlink",
+ "libsqlite3-sys",
+ "smallvec",
+]
+
 [[package]]
 name = "rustc-hash"
 version = "1.1.0"
@@ -1606,6 +1679,12 @@ version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "eb703cfe953bccee95685111adeedb76fabe4e97549a58d16f03ea7b9367bb32"
 
+[[package]]
+name = "smallvec"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fd0db749597d91ff862fd1d55ea87f7855a744a8425a64695b6fca237d1dad1"
+
 [[package]]
 name = "socket2"
 version = "0.4.4"
@@ -1926,6 +2005,12 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "accd4ea62f7bb7a82fe23066fb0957d48ef677f6eeb8215f372f52e48bb32426"
 
+[[package]]
+name = "version_check"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+
 [[package]]
 name = "want"
 version = "0.3.0"
diff --git a/Cargo.toml b/Cargo.toml
index dfa625c..94e1f4f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,6 +32,7 @@ parse-size = "1"
 proc_macros = { path = "proc_macros" }
 regex = "1"
 reqwest = { version = "0.11", features = ["brotli", "deflate", "gzip", "rustls-tls", "socks", "stream"] }
+rusqlite = { version = "0.28", features = ["bundled", "chrono", "winsqlite3"], optional = true }
 RustyXML = "0.3"
 tokio = { version = "1.20", features = ["rt", "macros", "rt-multi-thread", "time"] }
 url = "2.2"
@@ -43,10 +44,12 @@ bindgen = { version = "0.60", optional = true }
 cmake = { version = "0.1", optional = true }
 
 [features]
-all = ["exif", "ugoira", "server"]
+all = ["db", "db_sqlite", "exif", "ugoira", "server"]
 avdict = ["bindgen", "cmake", "flagset"]
+db = []
+db_sqlite = ["rusqlite"]
 exif = ["bindgen", "c_fixed_string", "cmake", "link-cplusplus", "utf16string"]
-server = ["async-trait", "hyper"]
+server = ["async-trait", "db", "hyper"]
 ugoira = ["avdict", "bindgen", "cmake", "link-cplusplus"]
 
 [profile.release-with-debug]
diff --git a/doc/db/authors.md b/doc/db/authors.md
new file mode 100644
index 0000000..e8404b0
--- /dev/null
+++ b/doc/db/authors.md
@@ -0,0 +1,10 @@
+| Name | Description | Type |
+|:----:|:-----------:|:----:|
+| id | User id | integer |
+| name | Author name | string |
+| creator_id | Fanbox creator id | string |
+| icon | File id of icon | integer |
+| big_icon | File id of big icon | integer |
+| background | File id of background | integer |
+| comment | Author comment | string |
+| webpage | Author webpage | string |
diff --git a/doc/db/files.md b/doc/db/files.md
new file mode 100644
index 0000000..9c0eb22
--- /dev/null
+++ b/doc/db/files.md
@@ -0,0 +1,7 @@
+| Name | Description | Type |
+|:----:|:-----------:|:----:|
+| id | File id | integer |
+| path | The path of the file | string |
+| last_modified | The last time the file was modified(HTTP Header) | timestamp |
+| etag | The etag(HTTP Header) of the file | string |
+| url | The source url | string |
diff --git a/doc/db/pixiv_artworks.md b/doc/db/pixiv_artworks.md
index ff22f30..decc43b 100644
--- a/doc/db/pixiv_artworks.md
+++ b/doc/db/pixiv_artworks.md
@@ -5,3 +5,4 @@
 | author | Author name | string |
 | uid | User id of the author | integer |
 | description | Description of artwork | string |
+| count | Number of pages | integer |
diff --git a/doc/db/pixiv_files.md b/doc/db/pixiv_files.md
new file mode 100644
index 0000000..34d45cf
--- /dev/null
+++ b/doc/db/pixiv_files.md
@@ -0,0 +1,5 @@
+| Name | Description | Type |
+|:----:|:-----------:|:----:|
+| id | Artwork id | integer |
+| file_id | File id | integer |
+| page | Page number | integer |