Make Consistent

Author: dumindu

content/en/labs/a2.initialize-the-server.md

@@ -5,13 +5,17 @@ slug: initialize-the-server
 
 ## Create New Workspace
 
+> [!tip]
+> We build an Axum based web service inside the `book_service` crate within the `rest_api_workspace` Rust workspace.
+
 Run following commands to create the workspace.
 
 ```shell
 mkdir rest_api_workspace && cd rest_api_workspace
 echo -e "[workspace]\nresolver = \"3\"" > ./Cargo.toml
 cargo new crates/book_service
-mkdir crates/book_service/src/bin && mv crates/book_service/src/main.rs crates/book_service/src/bin/app.rs
+mkdir crates/book_service/src/bin
+mv crates/book_service/src/main.rs crates/book_service/src/bin/app.rs
 ```
 
 Then manually update `book_service/Cargo.toml` to add `default-run` and `[[bin]]`.

content/en/labs/a4.database-and-db-migrations.md

@@ -5,6 +5,11 @@ slug: database-and-db-migrations
 
 ## Database Design
 
+> [!tip]
+> - To keep this series simple, we use only a single Postgres database table named `books`.
+> - We order fixed-width table columns by decreasing alignment requirements to optimize using Column Tetris.
+> - We map `TIMESTAMPTZ`, `DATE`, `UUID` types to `jiff::{Timestamp, civil::Date}`, `uuid::Uuid` Rust types.
+
 | Column Name    | Datatype    | Not Null | Primary Key |
 |----------------|-------------|----------|-------------|
 | created_at     | TIMESTAMPTZ | ✅       |             |