feat: add Copilot instructions for database command style and credential handling

.github/copilot-instructions.md

@@ -0,0 +1,18 @@
+# Copilot Instructions
+
+## Database Command Style
+
+When suggesting database commands in this repository, always use credentials loaded from `.env` inline in the command.
+
+Required pattern:
+- Read `MARIADB_ROOT_PASSWORD` from `.env` with `grep` and sanitize quotes/CRLF.
+- Read `MARIADB_DATABASE` from `.env` with `grep` and sanitize quotes/CRLF.
+- Pass both values directly to `mariadb` command invocations.
+
+Preferred one-liner style:
+
+```bash
+docker exec -i recipe-db mariadb -uroot -p"$(grep -E '^[[:space:]]*MARIADB_ROOT_PASSWORD[[:space:]]*=' .env | tail -n1 | sed -E 's/^[^=]*=[[:space:]]*//; s/[[:space:]]+$//; s/^["'\''']|["'\''']$//g' | tr -d '\r')" "$(grep -E '^[[:space:]]*MARIADB_DATABASE[[:space:]]*=' .env | tail -n1 | sed -E 's/^[^=]*=[[:space:]]*//; s/[[:space:]]+$//; s/^["'\''']|["'\''']$//g' | tr -d '\r')" -e "SELECT 1;"
+```
+
+Do not suggest hardcoded passwords for MariaDB commands.

README.md

@@ -229,6 +229,18 @@ curl http://localhost:8080/api/health
 curl http://localhost:8080/api/health/db
 ```
 
+### Databas (one-liners via .env)
+
+Anvand dessa kommandon vid drift/felsokning for att alltid lasa MariaDB-credentials direkt fran `.env`.
+
+```bash
+# Visa senaste Prisma-migreringar
+docker exec -i recipe-db mariadb -uroot -p"$(grep -E '^[[:space:]]*MARIADB_ROOT_PASSWORD[[:space:]]*=' .env | tail -n1 | sed -E 's/^[^=]*=[[:space:]]*//; s/[[:space:]]+$//; s/^["'\''']|["'\''']$//g' | tr -d '\r')" "$(grep -E '^[[:space:]]*MARIADB_DATABASE[[:space:]]*=' .env | tail -n1 | sed -E 's/^[^=]*=[[:space:]]*//; s/[[:space:]]+$//; s/^["'\''']|["'\''']$//g' | tr -d '\r')" -e "SELECT migration_name, finished_at FROM _prisma_migrations ORDER BY finished_at DESC LIMIT 10;"
+
+# Kontrollera att HelpText-tabellen finns
+docker exec -i recipe-db mariadb -uroot -p"$(grep -E '^[[:space:]]*MARIADB_ROOT_PASSWORD[[:space:]]*=' .env | tail -n1 | sed -E 's/^[^=]*=[[:space:]]*//; s/[[:space:]]+$//; s/^["'\''']|["'\''']$//g' | tr -d '\r')" "$(grep -E '^[[:space:]]*MARIADB_DATABASE[[:space:]]*=' .env | tail -n1 | sed -E 's/^[^=]*=[[:space:]]*//; s/[[:space:]]+$//; s/^["'\''']|["'\''']$//g' | tr -d '\r')" -e "SHOW TABLES LIKE 'HelpText';"
+```
+
 ---
 
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