Harden scripts and restore workflow

sql/playground.sql

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+/* ------------------------------------------------------------
+   sql/playground.sql
+   Local playground for SQL Server 2025 in Docker
+   ------------------------------------------------------------ */
+
+-- Basic server info
+SELECT
+  @@SERVERNAME   AS ServerName,
+  @@VERSION      AS SqlServerVersion,
+  SYSDATETIME()  AS ServerTimeLocal,
+  SYSUTCDATETIME() AS ServerTimeUtc;
+
+-- Switch to your dev database (created by seed/migrations)
+IF DB_ID(N'DevDb') IS NULL
+BEGIN
+  PRINT 'Database DevDb does not exist yet. Run: ./scripts/seed.sh and ./scripts/migrate.sh';
+  RETURN;
+END
+GO
+
+USE DevDb;
+GO
+
+SELECT DB_NAME() AS CurrentDatabase;
+GO
+
+-- Check if example table exists and query it
+IF OBJECT_ID(N'dbo.Customer', N'U') IS NULL
+BEGIN
+  PRINT 'Table dbo.Customer does not exist yet. Run: ./scripts/migrate.sh';
+END
+ELSE
+BEGIN
+  PRINT 'dbo.Customer exists. Running sample queries...';
+
+  SELECT TOP (10) *
+  FROM dbo.Customer
+  ORDER BY CustomerId DESC;
+
+  SELECT COUNT(*) AS CustomerCount
+  FROM dbo.Customer;
+END
+GO
+
+/* ------------------------------------------------------------
+   Scratch area (write your own queries below)
+   ------------------------------------------------------------ */
+
+-- Example:
+-- SELECT TOP (100) *
+-- FROM dbo.Customer
+-- ORDER BY CustomerId;
+

sql/test.sql

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+SELECT @@VERSION AS Version;
+SELECT DB_NAME() AS CurrentDb;
+SELECT GETDATE() AS CurrentDateTime;