The answer depends on what exactly you want to do.
If you want to change the location in the UI where a policy appears use the "Policies" table:
- PolicyDepthType (controls which of the 3 tiers or rows the policy is in. From top to bottom it should be "POLICY_DEPTH_MODERATE", "POLICY_DEPTH_DEVOTED" or "POLICY_DEPTH_EXTREME")
- GridX (Controls the horizontal placement, should be 1-5 but BE only uses 1, 3, 5)
- GridY (should be 0, 1 or 2)
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If you're asking about how to change which virtues are prereqs for other virtues, that is controlled by the "Policy_PrereqORPolicies" table.
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Depending on what changes you're trying to make using SQL can allow altering multiple things with a single command.