Convex auto-syncs env vars across deployments

Managing environment variables across divergent development, preview, and production instances has long been one of Convex's most persistent developer friction points. This dashboard quality-of-life fix turns a tedious multi-step CLI chore into a single-click workflow for full-stack teams.

• –Previously, project-level environment defaults only applied to newly spun-up deployments, forcing engineers to manually backfill active instances via the CLI.
• –The new confirmation modal provides fine-grained control, letting teams select specific target environments (Development, Preview, Production) and explicitly upsert values.
• –For AI-assisted development workflows where agents frequently configure new third-party integrations and API keys, reducing configuration drift between preview branches and production is critical.
• –Overwrite safeguards warn developers when existing deployment values will be replaced, mitigating accidental credential clobbering across active deployments.