cubicweb #344863 during migration, session should'nt release their pool after read queries [resolved]

even when they're not in 'write mode'. Else we may get deadlock w/ locks acquired by read transaction / ALTER table lock (seen in docaster 0.8 migration)

prioritynormal
typebug
done in3.3.5
load0.200
load left0.000
closed by<not specified>