migrate files + upload meta data

backend/internal/db/queries/files.sql

@@ -0,0 +1,21 @@
+-- name: GetFile :one
+SELECT * FROM files
+WHERE id = ? LIMIT 1;
+
+-- name: ListFiles :many
+SELECT * FROM files
+ORDER BY created_at DESC;
+
+-- name: CreateFile :one
+INSERT INTO files (id, name, mime_type, size, storage_key, checksum, created_at, updated_at)
+VALUES (?, ?, ?, ?, ?, ?, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP)
+RETURNING *;
+
+-- name: UpdateFile :exec
+UPDATE files
+SET name = ?, mime_type = ?, ocr_text = ?, updated_at = CURRENT_TIMESTAMP
+WHERE id = ?;
+
+-- name: DeleteFile :exec
+DELETE FROM files
+WHERE id = ?;