fix(dev): make clear_db.sh actual bash and drop the inline password

clear_db.sh

@@ -1,7 +1,27 @@
 #!/bin/bash
+# Dropa e recria o banco do zero.
+#
+# As credenciais vem do DATABASE_URL: do ambiente, se ja exportado, senao do
+# .env. Nada de senha em texto no script (a versao antiga tinha, e usava
+# `set -Ux`, que e fish, num arquivo que declara bash: a variavel nunca era
+# exportada).
+set -e
+cd "$(dirname "$0")"
 
-echo "drop database agenda;" | psql postgres -U agenda
-echo "create database agenda;"| psql postgres -U agenda
+if [ -z "$DATABASE_URL" ]; then
+  set -a
+  source .env
+  set +a
+fi
 
-set -Ux DATABASE_URL postgres://agenda:!agenda123@localhost:5432/agenda
-sqlx migrate run
+DB="${DATABASE_URL##*/}"
+ADMIN_URL="${DATABASE_URL%/*}/postgres"
+
+psql "$ADMIN_URL" -c "DROP DATABASE IF EXISTS $DB;"
+psql "$ADMIN_URL" -c "CREATE DATABASE $DB;"
+
+if command -v sqlx > /dev/null; then
+  sqlx migrate run
+else
+  echo "sqlx-cli nao instalado; as migrations rodam no proximo 'cargo run'."
+fi