Large 0.3 changes

- Split the gigantic mess that web.rs was into seperate files
- Split the app into two clear functions: web and bot
- Add privacy policy
- Add privacy
- Make the site respect GDPR and Discord ToS
- Add basic API
- Add timezone detection and automatic time changes

src/archive_stats.rs

@@ -0,0 +1,57 @@
+use sqlx::PgPool;
+
+pub struct ArchiveStats {
+    pub messages: i64,
+    pub users: i64,
+    pub servers: i64,
+    pub channels: i64,
+    pub total_storage: i64,
+    pub message_storage: i64,
+    pub attachment_storage: i64,
+}
+
+pub async fn load(pool: &PgPool) -> Result<ArchiveStats, sqlx::Error> {
+    let stats = sqlx::query_as::<_, (i64, i64, i64, i64, i64, i64, i64)>(
+        "SELECT
+             (SELECT COUNT(*) FROM messages),
+             (SELECT COUNT(DISTINCT author_id) FROM messages),
+             (SELECT COUNT(*) FROM guilds),
+             (SELECT COUNT(*) FROM channels),
+             (SELECT COALESCE(SUM(OCTET_LENGTH(content)), 0)
+              FROM message_versions)
+                 + (SELECT COALESCE(SUM(OCTET_LENGTH(data)), 0)
+                    FROM attachments),
+             (SELECT COALESCE(SUM(OCTET_LENGTH(content)), 0)
+              FROM message_versions),
+             (SELECT COALESCE(SUM(OCTET_LENGTH(data)), 0)
+              FROM attachments);",
+    )
+    .fetch_one(pool)
+    .await?;
+    Ok(ArchiveStats {
+        messages: stats.0,
+        users: stats.1,
+        servers: stats.2,
+        channels: stats.3,
+        total_storage: stats.4,
+        message_storage: stats.5,
+        attachment_storage: stats.6,
+    })
+}
+
+pub fn format_bytes(bytes: i64) -> String {
+    const UNITS: [&str; 5] = ["bytes", "KB", "MB", "GB", "TB"];
+
+    let mut size = bytes.max(0) as f64;
+    let mut unit = 0;
+    while size >= 1024.0 && unit < UNITS.len() - 1 {
+        size /= 1024.0;
+        unit += 1;
+    }
+
+    if unit == 0 {
+        format!("{} {}", bytes.max(0), UNITS[unit])
+    } else {
+        format!("{:.1} {}", size, UNITS[unit])
+    }
+}