migrated migration logic from rusqlite to sqlx and updated relevant async methods for better database interaction

backend-rust/Cargo.toml

@@ -6,5 +6,7 @@ edition = "2024"
 [dependencies]
 anyhow = "1.0"
 tokio = { version = "1", features = ["full"] }
-tokio-rusqlite = "0.6.0"
-rusqlite = "=0.32.0"
+axum = "0.8.4"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+sqlx = { version = "0.8", features = ["runtime-tokio", "tls-native-tls", "sqlite", "macros", "migrate", "chrono", "json"] }