WIP: draft for stake table contract #5931

Job	Run time
Build test artifacts (postgres)	15m 42s
Build test artifacts (sqlite)	13m 16s
Build test binaries	7m 47s
demo-native	2m 20s
test-sqlite (1)	3m 56s
test-sqlite (2)	5m 25s
test-sqlite (3)	4m 2s
test-sqlite (4)	3m 6s
test-sqlite (5)	3m 34s
test-sqlite (6)	2m 42s
test-sqlite (7)	3m 47s
test-sqlite (8)	3m 20s
test-sqlite (9)	2m 22s
test-sqlite (10)	2m 23s
test-integration (2)	11m 25s
test-postgres (1)	7m 14s
test-integration (99)	4m 21s
test-postgres (2)	3m 24s
test-postgres (3)	3m 55s
test-postgres (4)	1m 48s
test-postgres (5)	3m 14s
test-postgres (6)	1m 59s
test-postgres (7)	3m 53s
test-postgres (8)	2m 10s
test-postgres (9)	2m 9s
test-postgres (10)	2m 8s
	2h 1m 22s

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