cradle-sql: add page

pages/common/cradle-sql.md

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+# cradle sql
+
+> Manage Cradle SQL databases.
+
+- Rebuild the database schema:
+
+`cradle sql build`
+
+- Rebuild the database schema for a specific package:
+
+`cradle sql build {{package}}`
+
+- Truncate the entire database:
+
+`cradle sql flush`
+
+- Truncate the database tables for a specific package:
+
+`cradle sql flush {{package}}`
+
+- Populate the tables for all packages:
+
+`cradle sql populate`
+
+- Populate the tables for a specific package:
+
+`cradle sql populate {{package}}`