diff --git a/Cargo.lock b/Cargo.lock
index b5d7963..cc13e09 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -22,6 +22,15 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.65"
@@ -155,6 +164,19 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "chrono"
+version = "0.4.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bfd4d1b31faaa3a89d7934dbded3111da0d2ef28e3ebccdb4f0179f5929d1ef1"
+dependencies = [
+ "iana-time-zone",
+ "num-integer",
+ "num-traits",
+ "serde",
+ "winapi",
+]
+
 [[package]]
 name = "clap"
 version = "4.0.15"
@@ -202,6 +224,16 @@ dependencies = [
  "os_str_bytes",
 ]
 
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "combine"
 version = "4.6.6"
@@ -238,6 +270,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5827cebf4670468b8772dd191856768aedcb1b0278a04f989f7766351917b9dc"
+
 [[package]]
 name = "cpufeatures"
 version = "0.2.5"
@@ -325,6 +363,85 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "cxx"
+version = "1.0.80"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b7d4e43b25d3c994662706a1d4fcfc32aaa6afd287502c111b237093bb23f3a"
+dependencies = [
+ "cc",
+ "cxxbridge-flags",
+ "cxxbridge-macro",
+ "link-cplusplus",
+]
+
+[[package]]
+name = "cxx-build"
+version = "1.0.80"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84f8829ddc213e2c1368e51a2564c552b65a8cb6a28f31e576270ac81d5e5827"
+dependencies = [
+ "cc",
+ "codespan-reporting",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "scratch",
+ "syn",
+]
+
+[[package]]
+name = "cxxbridge-flags"
+version = "1.0.80"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e72537424b474af1460806647c41d4b6d35d09ef7fe031c5c2fa5766047cc56a"
+
+[[package]]
+name = "cxxbridge-macro"
+version = "1.0.80"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "309e4fb93eed90e1e14bea0da16b209f81813ba9fc7830c20ed151dd7bc0a4d7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "darling"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4529658bdda7fd6769b8614be250cdcfc3aeb0ee72fe66f9e41e5e5eb73eac02"
+dependencies = [
+ "darling_core",
+ "darling_macro",
+]
+
+[[package]]
+name = "darling_core"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "649c91bc01e8b1eac09fb91e8dbc7d517684ca6be8ebc75bb9cafc894f9fdb6f"
+dependencies = [
+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim",
+ "syn",
+]
+
+[[package]]
+name = "darling_macro"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddfc69c5bfcbd2fc09a0f38451d2daf0e372e367986a83906d1b0dbc88134fb5"
+dependencies = [
+ "darling_core",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "difflib"
 version = "0.4.0"
@@ -637,6 +754,36 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f5a6ef98976b22b3b7f2f3a806f858cb862044cfa66805aa3ad84cb3d3b785ed"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "winapi",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0703ae284fc167426161c2e3f1da3ea71d94b21bedbcc9494e92b28e334e3dca"
+dependencies = [
+ "cxx",
+ "cxx-build",
+]
+
+[[package]]
+name = "ident_case"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
+
 [[package]]
 name = "idna"
 version = "0.3.0"
@@ -673,6 +820,7 @@ checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
 dependencies = [
  "autocfg",
  "hashbrown",
+ "serde",
 ]
 
 [[package]]
@@ -731,6 +879,15 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "link-cplusplus"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9272ab7b96c9046fbc5bc56c06c117cb639fe2d509df0c421cad82d2915cf369"
+dependencies = [
+ "cc",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.9"
@@ -799,6 +956,16 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "61807f77802ff30975e01f4f071c8ba10c022052f98b3294119f3e615d13e5be"
 
+[[package]]
+name = "num-integer"
+version = "0.1.45"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "225d3389fb3509a24c93f5c29eb6bde2586b98d9f016636dff58d7c6f7569cd9"
+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.15"
@@ -818,6 +985,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "num_threads"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2819ce041d2ee131036f4fc9d6ae7ae125a3a40e97ba64d04fe799ad9dabbb44"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.15.0"
@@ -1091,6 +1267,9 @@ dependencies = [
  "env_logger",
  "log",
  "predicates",
+ "serde",
+ "serde_json",
+ "serde_with",
  "sha-1",
  "sqlx",
  "strum",
@@ -1126,6 +1305,12 @@ version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97477e48b4cf8603ad5f7aaf897467cf42ab4218a38ef76fb14c2d6773a6d6a8"
 
+[[package]]
+name = "ryu"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
+
 [[package]]
 name = "same-file"
 version = "1.0.6"
@@ -1141,6 +1326,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 
+[[package]]
+name = "scratch"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8132065adcfd6e02db789d9285a0deb2f3fcb04002865ab67d5fb103533898"
+
 [[package]]
 name = "sct"
 version = "0.7.0"
@@ -1153,24 +1344,63 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.145"
+version = "1.0.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "728eb6351430bccb993660dfffc5a72f91ccc1295abaa8ce19b27ebe4f75568b"
+checksum = "d193d69bae983fc11a79df82342761dfbf28a99fc8d203dca4c3c1b590948965"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.145"
+version = "1.0.147"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81fa1584d3d1bcacd84c277a0dfe21f5b0f6accf4a23d04d4c6d61f1af522b4c"
+checksum = "4f1d362ca8fc9c3e3a7484440752472d68a6caa98f1ab81d99b5dfe517cec852"
 dependencies = [
  "proc-macro2",
  "quote",
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.87"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ce777b7b150d76b9cf60d28b55f5847135a003f7d7350c6be7a773508ce7d45"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "serde_with"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "368f2d60d049ea019a84dcd6687b0d1e0030fe663ae105039bdf967ed5e6a9a7"
+dependencies = [
+ "base64",
+ "chrono",
+ "hex",
+ "indexmap",
+ "serde",
+ "serde_json",
+ "serde_with_macros",
+ "time",
+]
+
+[[package]]
+name = "serde_with_macros"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1ccadfacf6cf10faad22bbadf55986bdd0856edfb5d9210aa1dcf1f516e84e93"
+dependencies = [
+ "darling",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "sha-1"
 version = "0.10.0"
@@ -1327,6 +1557,8 @@ dependencies = [
  "percent-encoding",
  "rustls",
  "rustls-pemfile",
+ "serde",
+ "serde_json",
  "sha2",
  "smallvec",
  "sqlformat",
@@ -1350,6 +1582,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
+ "serde_json",
  "sha2",
  "sqlx-core",
  "sqlx-rt",
@@ -1472,6 +1705,18 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "time"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d634a985c4d4238ec39cacaed2e7ae552fbd3c476b552c1deac3021b7d7eaf0c"
+dependencies = [
+ "itoa",
+ "libc",
+ "num_threads",
+ "serde",
+]
+
 [[package]]
 name = "tinyvec"
 version = "1.6.0"
@@ -1599,6 +1844,12 @@ version = "1.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fdbf052a0783de01e944a6ce7a8cb939e295b1e7be835a1112c3b9a7f047a5a"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+
 [[package]]
 name = "unicode_categories"
 version = "0.1.1"
diff --git a/Cargo.toml b/Cargo.toml
index 3364d1d..c7aa70d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,8 +13,11 @@ strum = "0.24.0"
 strum_macros = "0.24.0"
 anyhow = "1.0.57"
 tokio = { version = "1.21.2", features = ["macros"] }
-sqlx = { version = "0.6.2", features = ["sqlite", "runtime-tokio-rustls"] }
+sqlx = { version = "0.6.2", features = ["sqlite", "runtime-tokio-rustls", "json"] }
 async-recursion = "1.0.0"
+serde_json = "1.0.87"
+serde = "1.0.147"
+serde_with = { version = "2.0.1", features = ["base64"] }
 
 [dev-dependencies]
 assert_cmd = "2.0.4"
diff --git a/migrations/20221015221015_initial.sql b/migrations/20221015221015_initial.sql
index 036577a..5b33fbb 100644
--- a/migrations/20221015221015_initial.sql
+++ b/migrations/20221015221015_initial.sql
@@ -1,7 +1,7 @@
 CREATE TABLE "objects" (
   "id" TEXT PRIMARY KEY,
   "type" TEXT NOT NULL CHECK("type" IN ('blob','tree')),
-  "data" BLOB NOT NULL
+  "data" TEXT NOT NULL
 ) STRICT;
 
 CREATE INDEX "objects_id" ON "objects"("id");
diff --git a/src/data.rs b/src/data.rs
index 3572294..ecdbdfb 100644
--- a/src/data.rs
+++ b/src/data.rs
@@ -1,5 +1,8 @@
 use anyhow::{anyhow, Context as Context_};
 use async_recursion::async_recursion;
+use serde::{Deserialize, Serialize};
+use serde_with::serde_as;
+use serde_with::base64::Base64;
 use sha1::{Digest, Sha1};
 use sqlx::sqlite::SqliteConnectOptions;
 use sqlx::{ConnectOptions, SqliteConnection, Type};
@@ -19,7 +22,9 @@ impl std::fmt::Display for OID {
     }
 }
 
-#[derive(Display, Debug, PartialEq, EnumString, Eq, PartialOrd, Ord, Type)]
+#[derive(
+    Display, Debug, PartialEq, EnumString, Eq, PartialOrd, Ord, Type, Serialize, Deserialize,
+)]
 #[sqlx(rename_all = "lowercase")]
 pub enum ObjectType {
     #[strum(serialize = "blob")]
@@ -34,6 +39,15 @@ pub struct Context {
     conn: SqliteConnection,
 }
 
+#[serde_as]
+#[derive(Serialize, Deserialize)]
+struct ObjectData {
+    typ: String,
+
+    #[serde_as(as = "Base64")]
+    data: Vec<u8>,
+}
+
 impl Context {
     // FIXME: error messages don't maeke sense.
     pub async fn new(repo_file: PathBuf, init: bool) -> anyhow::Result<Self> {
@@ -75,11 +89,15 @@ impl Context {
         hasher.update(&data);
         let hash = OID(format!("{:x}", hasher.finalize()));
 
+        let foo = sqlx::types::Json(ObjectData {
+            typ: String::from("coucou"),
+            data,
+        });
         sqlx::query!(
             "INSERT OR IGNORE INTO objects(id, type, data) VALUES (?1, ?2, ?3)",
             hash,
             typ,
-            data
+            foo,
         )
         .execute(&mut self.conn)
         .await
@@ -121,7 +139,9 @@ impl Context {
                 object_type
             ))
         } else {
-            Ok(record.data)
+            let data: ObjectData =
+                serde_json::from_str(&record.data).context("invalid format in database")?;
+            Ok(data.data)
         }
     }