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The `spell_group_stack_rules` table

Table defines if auras in one spell_group can't stack with each other.

Notes: The table doesn't affect persistent area auras stacking or passive auras stacking (they can stack always) or spells belonging to same spell_rank (they are always subject of SPELL_GROUP_STACK_RULE_EXCLUSIVE rule)

Field	Type	Attributes	Key	Null	Default	Extra	Comment
group_id	int(11)	unsigned	PRI	NO	0
stack_rule	tinyint(3)	signed		NO	0

Description of the fields

group_id

Id of group in spell_group table. The spell_group may contain another spell_groups inside, if so stacking rule needs to be defined for these groups separately.

stack_rule

Enum SpellGroupStackRule in core:

Id	Stack Rule Name	Description
0	SPELL_GROUP_STACK_RULE_DEFAULT	No stacking rule defined - placeholder
1	SPELL_GROUP_STACK_RULE_EXCLUSIVE	Auras from group can't stack with each other
2	SPELL_GROUP_STACK_RULE_EXCLUSIVE_FROM_SAME_CASTER	Auras from group can't stack with each other when cast by same caster
3	SPELL_GROUP_STACK_RULE_EXCLUSIVE_SAME_EFFECT	Same effects of spells will not stack, yet auras will remain on a target
4	SPELL_GROUP_STACK_RULE_EXCLUSIVE_HIGHEST	Only Highest effect will remain on target

A spell should be in only 1 group with this stack rule.

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