refactor: remove PostgreSQL feature-flagged support

- Remove sqlite/postgres feature flags from Cargo.toml
- Replace "any" sqlx feature with direct "sqlite" feature
- Remove all #[cfg] conditional compilation from database.rs
- Update README.md and CLAUDE.md to reflect SQLite-only support

CLAUDE.md

@@ -7,7 +7,7 @@ Brewlog is a self-hosted coffee logging platform built in Rust. It provides:
 - HTTP server with web UI (Axum + Askama templates + Datastar)
 - REST API for programmatic access
 - CLI client for command-line operations
-- SQLite/PostgreSQL database support (feature-flagged)
+- SQLite database
 
 ## Build & Test Commands
 

Cargo.toml

@@ -3,11 +3,6 @@ name = "brewlog"
 version = "0.1.0"
 edition = "2024"
 
-[features]
-default = ["sqlite"]
-sqlite = ["sqlx/sqlite"]
-postgres = ["sqlx/postgres"]
-
 [dependencies]
 anyhow = "1.0"
 async-trait = "0.1"
@@ -29,7 +24,7 @@ sqlx = { version = "0.7", default-features = false, features = [
     "tls-rustls",
     "macros",
     "chrono",
-    "any",
+    "sqlite",
     "migrate",
 ] }
 thiserror = "1.0"

README.md

@@ -9,7 +9,7 @@ CLI client.
 - **CLI client** for terminal-based workflows
 - **AI extraction** — scan a coffee bag label or type a description to auto-fill forms (via [OpenRouter](https://openrouter.ai/))
 - **Nearby cafe search** powered by [Foursquare Places](https://docs.foursquare.com/developer/reference/place-search)
-- **SQLite** (default) or **PostgreSQL** (compile-time feature flag)
+- **SQLite** database
 - **Passkey authentication** — no passwords, WebAuthn only
 
 ## Quick Start
@@ -19,8 +19,6 @@ CLI client.
 ```bash
 cargo install --git https://github.com/jnsgruk/brewlog.git
 
-# For PostgreSQL instead of SQLite:
-# cargo install --git https://github.com/jnsgruk/brewlog.git --no-default-features --features postgres
 ```
 
 ### Configure
@@ -102,14 +100,7 @@ directory is loaded automatically via [dotenvy](https://crates.io/crates/dotenvy
 
 ### Database
 
-SQLite is the default. PostgreSQL is supported via a compile-time feature flag:
-
-```bash
-cargo build --release                                          # SQLite
-cargo build --release --features postgres --no-default-features  # PostgreSQL
-```
-
-Migrations run automatically on server startup.
+SQLite is used for storage. Migrations run automatically on server startup.
 
 ## Contributing
 

src/infrastructure/database.rs

@@ -1,41 +1,18 @@
 use anyhow::Context;
 use sqlx::migrate::Migrator;
 
-#[cfg(all(feature = "sqlite", feature = "postgres"))]
-compile_error!("features `sqlite` and `postgres` cannot both be enabled");
-
-#[cfg(not(any(feature = "sqlite", feature = "postgres")))]
-compile_error!("enable either the `sqlite` or `postgres` feature");
-
-#[cfg(feature = "sqlite")]
 pub type DatabasePool = sqlx::SqlitePool;
-#[cfg(feature = "sqlite")]
 type PoolOptions = sqlx::sqlite::SqlitePoolOptions;
-#[cfg(feature = "sqlite")]
 pub type DatabaseTransaction<'a> = sqlx::Transaction<'a, sqlx::Sqlite>;
-#[cfg(feature = "sqlite")]
 pub type DatabaseRow = sqlx::sqlite::SqliteRow;
-#[cfg(feature = "sqlite")]
 pub type DatabaseDriver = sqlx::Sqlite;
 
-#[cfg(feature = "postgres")]
-pub type DatabasePool = sqlx::PgPool;
-#[cfg(feature = "postgres")]
-type PoolOptions = sqlx::postgres::PgPoolOptions;
-#[cfg(feature = "postgres")]
-pub type DatabaseTransaction<'a> = sqlx::Transaction<'a, sqlx::Postgres>;
-#[cfg(feature = "postgres")]
-pub type DatabaseRow = sqlx::postgres::PgRow;
-#[cfg(feature = "postgres")]
-pub type DatabaseDriver = sqlx::Postgres;
-
 pub struct Database {
     pool: DatabasePool,
 }
 
 impl Database {
     pub async fn connect(database_url: &str) -> anyhow::Result<Self> {
-        #[cfg(feature = "sqlite")]
         let pool = {
             use sqlx::sqlite::SqliteConnectOptions;
             use std::str::FromStr;
@@ -51,20 +28,10 @@ impl Database {
                 .with_context(|| format!("failed to connect to database: {database_url}"))?
         };
 
-        #[cfg(feature = "postgres")]
-        let pool = PoolOptions::new()
-            .max_connections(5)
-            .connect(database_url)
+        sqlx::query("PRAGMA foreign_keys = ON;")
+            .execute(&pool)
             .await
-            .with_context(|| format!("failed to connect to database: {database_url}"))?;
-
-        #[cfg(feature = "sqlite")]
-        {
-            sqlx::query("PRAGMA foreign_keys = ON;")
-                .execute(&pool)
-                .await
-                .context("failed to enable foreign keys for sqlite")?;
-        }
+            .context("failed to enable foreign keys for sqlite")?;
 
         let db = Self { pool };
         db.migrate().await?;