feat: update services to include transaction handling and refactor database connection setup

src-tauri/Cargo.toml

@@ -3,7 +3,7 @@ name = "otter"
 version = "0.1.0"
 description = "A Tauri App"
 authors = ["you"]
-edition = "2021"
+edition = "2024"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
@@ -23,9 +23,10 @@ tauri-plugin-opener = "2"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 async-trait = "0.1.89"
-decimal = "2.1.0"
+rust_decimal = "1.42.0"
 
 sea-orm.workspace = true
 migration = { path = "../crates/migration" }
 chrono.workspace = true
+thiserror = "2.0.18"