The full interface definition:

// TRCRead defines the TRC read operations.
type TRCRead interface {
	// TRCExists returns whether the TRC is found in the database and the
	// content matches. ErrContentMismatch is returned if the TRC is in the
	// database with differing contents.
	TRCExists(ctx context.Context, d decoded.TRC) (bool, error)
	// GetTRC returns the TRC. If it is not found, ErrNotFound is returned.
	GetTRC(ctx context.Context, isd addr.ISD, version scrypto.Version) (*trc.TRC, error)
	// GetRawTRC returns the raw signed TRC bytes. If it is not found,
	// ErrNotFound is returned.
	GetRawTRC(ctx context.Context, isd addr.ISD, version scrypto.Version) ([]byte, error)
	// GetTRCInfo returns the infos for the requested TRC. If it is not found,
	// ErrNotFound is returned.
	GetTRCInfo(ctx context.Context, isd addr.ISD, version scrypto.Version) (TRCInfo, error)
	// GetIssuingKeyInfo returns the infos of the requested AS. If it is not
	// found, ErrNotFound is returned.
	GetIssuingKeyInfo(ctx context.Context, ia addr.IA, version scrypto.Version) (KeyInfo, error)
}

// TRCWrite defines the TRC write operations.
type TRCWrite interface {
	// InsertTRC inserts the TRCs. The call returns true if the TRC was
	// inserter, or false if it already existed and the content matches.
	// ErrContentMismatch is returned if the TRC is in the database with
	// differing contents.
	InsertTRC(ctx context.Context, d decoded.TRC) (bool, error)
}

// ChainRead defines the certificate chain read operations.
type ChainRead interface {
	// GetRawChain returns the raw signed certificate chain bytes. If it is not
	// found, ErrNotFound is returned.
	GetRawChain(ctx context.Context, ia addr.IA, version scrypto.Version) ([]byte, error)
	// ChainExists returns whether the certificate chain is found in the
	// database and the content matches. ErrContentMismatch is returned if any
	// of the two certificates exist in the database with differing contents.
	ChainExists(ctx context.Context, d decoded.Chain) (bool, error)
}

// ChainWrite defines the certificate chain write operations.
type ChainWrite interface {
	// InsertChain inserts the certificate chain. The call returns true in the
	// first return value, if the certificate chain was inserted, or false if it
	// already existed and the contents matches. The second return value
	// indicates whether the issuer certificate was inserted, or it already
	// existed. ErrContentMismatch is returned if any of the two certificates
	// exist in the database with differing contents.
	InsertChain(ctx context.Context, d decoded.Chain) (bool, bool, error)
}

// TRCInfo contains metadata about a TRC.
type TRCInfo struct {
	Validity    scrypto.Validity
	GracePeriod time.Duration
	Version     scrypto.Version
}

// Base indicates if the TRC is a base TRC.
func (i TRCInfo) Base() bool {
	return i.GracePeriod == 0
}

// KeyInfo contains metadata about a primary key.
type KeyInfo struct {
	TRC     TRCInfo
	Version scrypto.KeyVersion
}

TrustDB: Implement certificate tables and queries in sqlite and test harness #3113

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