fix: expand SQLite home and environment paths

src/db/sqlite.rs

@@ -7,7 +7,7 @@ use crate::Result;
 
 pub(super) fn open(path: &Path) -> Result<Connection> {
     // An absolute existing path also prevents SQLite's special :memory: filename from creating a database.
-    let path = path.canonicalize()?;
+    let path = shellexpand::path::full(path)?.canonicalize()?;
     let connection = Connection::open_with_flags(
         path,
         OpenFlags::SQLITE_OPEN_READ_ONLY | OpenFlags::SQLITE_OPEN_NO_MUTEX,

src/main.rs

@@ -20,6 +20,8 @@ Use the in-app password field to keep credentials out of process arguments.
 Open an existing SQLite database file (read-only; missing files are not created):
   cargo run -- --sqlite ./database.sqlite
 SQLite paths can be relative or absolute; quote paths containing spaces.
+SQLite paths expand leading ~, $VAR, and ${VAR}; undefined variables are errors.
+Expansion never runs shell commands. Quote CLI paths to let dbdash expand them.
 
 PostgreSQL URLs and libpq-style key=value strings are accepted.
 Use sslmode=require for mandatory TLS; certificates and hostnames are verified.