schemadiff

type Change struct {
	// SQL is the literal statement, without a trailing semicolon.
	SQL string `json:"sql"`
	// Kind classifies the statement for consumers that gate by class.
	Kind ChangeKind `json:"kind"`
	// Destructive marks statements that discard data, constraints, or
	// indexes (column, constraint, and index drops — dropping a unique
	// index discards the same guarantee as dropping a unique constraint).
	// Destructive changes are gated by the caller, never executed
	// silently.
	Destructive bool `json:"destructive,omitempty"`
}

type ChangeKind string

type Column struct {
	// Name is the column name.
	Name string
	// Type is the canonical type text (format_type), e.g. "character
	// varying(50)" — never an alias like varchar(50).
	Type string
	// NotNull reports the NOT NULL attribute.
	NotNull bool
	// Default is the canonical default expression (pg_get_expr), empty when
	// none. For a generated column it is the generation expression.
	Default string
	// SequenceDefault reports that the default expression depends on a
	// sequence (per pg_depend) — a serial column or a hand-written nextval
	// default. In a desired-state model that sequence exists only inside
	// the rolled-back scratch transaction, so no derived plan can
	// reference it.
	SequenceDefault bool
	// Identity is the identity kind, IdentityNone for plain columns.
	Identity Identity
	// Generated reports GENERATED ALWAYS AS (...) STORED.
	Generated bool
}

type Constraint struct {
	// Name is the constraint name.
	Name string
	// Def is the canonical definition text.
	Def string
}

type Identity string

type Index struct {
	// Name is the index name.
	Name string
	// Def is the canonical CREATE INDEX statement.
	Def string
}

type Model struct {
	// Table is the unqualified table name.
	Table string
	// Columns are the table's columns in attribute order.
	Columns []Column
	// Constraints are the table constraints, name-sorted.
	Constraints []Constraint
	// Indexes are the non-constraint indexes, name-sorted.
	Indexes []Index
}