trying to rework database migrations

packs/core/runtimes/README.md

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+# Core Pack Runtime Metadata
+
+This directory contains runtime metadata YAML files for the core pack. Each file defines a runtime environment that can be used to execute actions and sensors.
+
+## File Structure
+
+Each runtime YAML file contains only the fields that are stored in the database:
+
+- `ref` - Unique runtime reference (format: pack.name)
+- `pack_ref` - Pack this runtime belongs to
+- `name` - Human-readable runtime name
+- `description` - Brief description of the runtime
+- `distributions` - Runtime verification and capability metadata (JSONB)
+- `installation` - Installation requirements and metadata (JSONB)
+
+## Available Runtimes
+
+- **python.yaml** - Python 3 runtime for actions and sensors
+- **nodejs.yaml** - Node.js runtime for JavaScript-based actions and sensors
+- **shell.yaml** - Shell (bash/sh) runtime - always available
+- **native.yaml** - Native compiled runtime (Rust, Go, C, etc.) - always available
+- **sensor_builtin.yaml** - Built-in sensor runtime for native Attune sensors
+
+## Loading
+
+Runtime metadata files are loaded by the pack loading system and inserted into the `runtime` table in the database.