diff --git a/Cargo.lock b/Cargo.lock
index 752424b15..596b44185 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1118,6 +1118,14 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6245d59a3e82a7fc217c5828a6692dbc6dfb63a0c8c90495621f7b9d79704a0e"
 
+[[package]]
+name = "core-derive"
+version = "0.1.0"
+dependencies = [
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.3"
@@ -1548,13 +1556,14 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "data-encoding",
- "ffmpeg-next",
  "kamadak-exif",
  "mime",
  "ring 0.16.20",
  "sdcore",
  "sha256",
  "thumbnailer",
+ "tokio",
+ "uhlc",
 ]
 
 [[package]]
@@ -1977,31 +1986,6 @@ dependencies = [
  "instant",
 ]
 
-[[package]]
-name = "ffmpeg-next"
-version = "5.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "585e5eaf57eceaa199ba6f6a1f46bdad7992930bb7b45b40275d9445b5ba2bc8"
-dependencies = [
- "bitflags 1.3.2",
- "ffmpeg-sys-next",
- "libc",
-]
-
-[[package]]
-name = "ffmpeg-sys-next"
-version = "5.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ba12dea33516e30c160ce557c7e43dd857276368eb1cd0eef4fce6529f2dee5"
-dependencies = [
- "bindgen",
- "cc",
- "libc",
- "num_cpus",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "field-offset"
 version = "0.3.4"
@@ -6062,9 +6046,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.17"
+version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "632d02bff7f874a36f33ea8bb416cd484b90cc66c1194b1a1110d067a7013f58"
+checksum = "a1feb54ed693b93a84e14094943b84b7c4eae204c512b7ccb95ab0c66d278ad1"
 dependencies = [
  "proc-macro2",
 ]
@@ -6608,6 +6592,7 @@ dependencies = [
  "cargo-edit",
  "chrono",
  "config",
+ "core-derive",
  "data-encoding",
  "dyn-clone",
  "env_logger",
@@ -6635,6 +6620,7 @@ dependencies = [
  "thumbnailer",
  "tokio",
  "ts-rs",
+ "uhlc",
  "uuid",
  "walkdir",
  "webp",
@@ -8261,6 +8247,20 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
 
+[[package]]
+name = "uhlc"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d74cc14aac0f650dae365e42250073bc0f89602bad5751d6159642be37690d6"
+dependencies = [
+ "hex",
+ "humantime",
+ "lazy_static",
+ "log",
+ "serde",
+ "uuid",
+]
+
 [[package]]
 name = "uint"
 version = "0.9.3"
diff --git a/Cargo.toml b/Cargo.toml
index 272882047..14553072c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,5 +2,6 @@
 members = [
 	"apps/debug",
 	"apps/desktop/src-tauri",
-	"core"
+	"core",
+	"core/derive"
 ]
diff --git a/apps/debug/Cargo.toml b/apps/debug/Cargo.toml
index 6ce0e11f3..d57a34e68 100644
--- a/apps/debug/Cargo.toml
+++ b/apps/debug/Cargo.toml
@@ -13,5 +13,7 @@ ring = "0.16.20"
 thumbnailer = "0.4.0"
 mime = "0.3.16"
 sha256 = "1.0.3"
-ffmpeg-next = "5.0.3"
-sdcore = { path = "../../core" }
\ No newline at end of file
+# ffmpeg-next = "5.0.3"
+sdcore = { path = "../../core" }
+uhlc = "0.4.1"
+tokio = { version = "1.17.0", features = ["sync", "rt"] }
diff --git a/apps/debug/src/main.rs b/apps/debug/src/main.rs
index c34d66f1e..2bbf73538 100644
--- a/apps/debug/src/main.rs
+++ b/apps/debug/src/main.rs
@@ -2,6 +2,22 @@
 
 pub mod checksum;
 
-fn main() {
-	checksum::do_thing();
+use sdcore::{prisma, sync::engine::test, sync::FakeCoreContext};
+
+#[tokio::main]
+async fn main() {
+	let db = prisma::new_client().await.unwrap();
+	let ctx = FakeCoreContext {};
+	test(&ctx).await;
+	// checksum::do_thing();
+
+	// create an HLC with a generated UUID and relying on SystemTime::now()
+	// let hlc = HLC::default();
+
+	// // generate timestamps
+	// let ts1 = hlc.new_timestamp();
+	// let ts2 = hlc.new_timestamp();
+
+	// println!("ts1 {}", ts1);
+	// println!("ts2 {}", ts2);
 }
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 917f9310a..35410def1 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -41,6 +41,7 @@ thumbnailer = "0.4.0"
 mime = "0.3.16"
 sysinfo = "0.23.5"
 thiserror = "1.0.30"
+core-derive = { path = "./derive" }
 
 tokio = { version = "1.17.0", features = ["sync", "rt"] }
 include_dir = {version = "0.7.2", features = ["glob"]}
@@ -48,3 +49,4 @@ async-trait = "0.1.52"
 dyn-clone = "1.0.5"
 image = "0.24.1"
 webp = "0.2.2"
+uhlc = "0.4.1"
diff --git a/extensions/twitter-history/prisma/schema.prisma b/extensions/twitter-history/prisma/schema.prisma
new file mode 100644
index 000000000..e69de29bb