distributable, please

docker/distributable/migrations/20250101000011_key_value_jsonb.sql

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+-- Migration: Convert key.value from TEXT to JSONB
+--
+-- This allows keys to store structured data (objects, arrays, numbers, booleans)
+-- in addition to plain strings. Existing string values are wrapped in JSON string
+-- literals so they remain valid and accessible.
+--
+-- Before: value TEXT NOT NULL  (e.g., 'my-secret-token')
+-- After:  value JSONB NOT NULL (e.g., '"my-secret-token"' or '{"user":"admin","pass":"s3cret"}')
+
+-- Step 1: Convert existing TEXT values to JSONB.
+-- to_jsonb(text) wraps a plain string as a JSON string literal, e.g.:
+--   'hello'  ->  '"hello"'
+-- This preserves all existing values perfectly — encrypted values (base64 strings)
+-- become JSON strings, and plain text values become JSON strings.
+ALTER TABLE key
+    ALTER COLUMN value TYPE JSONB
+    USING to_jsonb(value);