Create Initial Database Schema for Tasks. (#1)

Create migration scripts for this and initial Task DB Model in rust along with unit tests.

Reviewed-on: #1
Co-authored-by: Drew Galbraith <drew@tiramisu.one>
Co-committed-by: Drew Galbraith <drew@tiramisu.one>

justfile

@@ -1,6 +1,8 @@
 # Temporary until we have a frontend.
 set working-directory := 'backend'
 
+export DATABASE_URL :="sqlite://local.db"
+
 dev:
     cargo run
 
@@ -20,3 +22,14 @@ clean:
     cargo clean
 
 
+reset-db:
+    sqlx database drop
+    sqlx database create
+    sqlx migrate run
+
+migrate:
+    sqlx migrate run
+
+migrate-revert:
+    sqlx migrate revert
+