sqldb: define schemas for all graph node tables

In this commit, the various SQL schemas required to store graph node
related data is defined. Specifically, the following tables are defined:

- nodes
- node_extra_types
- node_features
- node_addresses

sqldb/sqlc/migrations/000007_graph.down.sql

@@ -0,0 +1,11 @@
+-- Drop indexes.
+DROP INDEX IF EXISTS nodes_unique;
+DROP INDEX IF EXISTS node_extra_types_unique;
+DROP INDEX IF EXISTS node_features_unique;
+DROP INDEX IF EXISTS node_addresses_unique;
+
+-- Drop tables in order of reverse dependencies.
+DROP TABLE IF EXISTS node_addresses;
+DROP TABLE IF EXISTS node_features;
+DROP TABLE IF EXISTS node_extra_types;
+DROP TABLE IF EXISTS nodes;

sqldb/sqlc/migrations/000007_graph.up.sql

@@ -0,0 +1,90 @@
+/* ─────────────────────────────────────────────
+   node data tables
+   ─────────────────────────────────────────────
+*/
+
+-- nodes stores all the nodes that we are aware of in the LN graph.
+CREATE TABLE IF NOT EXISTS nodes (
+    -- The db ID of the node. This will only be used DB level
+    -- relations.
+    id INTEGER PRIMARY KEY,
+
+    -- The protocol version that this node was gossiped on.
+    version SMALLINT NOT NULL,
+
+    -- The public key (serialised compressed) of the node.
+    pub_key BLOB NOT NULL,
+
+    -- The alias of the node.
+    alias TEXT,
+
+    -- The unix timestamp of the last time the node was updated.
+    last_update BIGINT,
+
+    -- The color of the node.
+    color VARCHAR,
+
+    -- The signature of the node announcement. If this is null, then
+    -- the node announcement has not been received yet and this record
+    -- is a shell node. This can be the case if we receive a channel
+    -- announcement for a channel that is connected to a node that we
+    -- have not yet received a node announcement for.
+    signature BLOB
+);
+
+-- A node (identified by a public key) can only have one active node
+-- announcement per protocol.
+CREATE UNIQUE INDEX IF NOT EXISTS nodes_unique ON nodes (
+    pub_key, version
+);
+
+-- node_extra_types stores any extra TLV fields covered by a node announcement that
+-- we do not have an explicit column for in the nodes table.
+CREATE TABLE IF NOT EXISTS node_extra_types (
+    -- The node id this TLV field belongs to.
+    node_id BIGINT NOT NULL REFERENCES nodes(id) ON DELETE CASCADE,
+
+    -- The Type field.
+    type BIGINT NOT NULL,
+
+    -- The value field.
+    value BLOB
+);
+CREATE UNIQUE INDEX IF NOT EXISTS node_extra_types_unique ON node_extra_types (
+    type, node_id
+);
+
+-- node_features contains the feature bits of a node.
+CREATE TABLE IF NOT EXISTS node_features (
+    -- The node id this feature belongs to.
+    node_id BIGINT NOT NULL REFERENCES nodes(id) ON DELETE CASCADE,
+
+    -- The feature bit value.
+    feature_bit INTEGER NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS node_features_unique ON node_features (
+    node_id, feature_bit
+);
+
+-- node_addresses contains the advertised addresses of nodes.
+CREATE TABLE IF NOT EXISTS node_addresses (
+    -- The node id this feature belongs to.
+    node_id BIGINT NOT NULL REFERENCES nodes(id) ON DELETE CASCADE,
+
+    -- An enum that represents the type of address. This will
+    -- dictate how the address column should be parsed.
+    type SMALLINT NOT NULL,
+
+    -- position is position of this address in the list of addresses
+    -- under the given type as it appeared in the node announcement.
+    -- We need to store this so that when we reconstruct the node
+    -- announcement, we preserve the original order of the addresses
+    -- so that the signature of the announcement remains valid.
+    position INTEGER NOT NULL,
+
+    -- The advertised address of the node.
+    address TEXT NOT NULL
+);
+CREATE UNIQUE INDEX IF NOT EXISTS node_addresses_unique ON node_addresses (
+    node_id, type, position
+);

sqldb/sqlc/models.go

@@ -102,3 +102,31 @@ type MigrationTracker struct {
 	Version       int32
 	MigrationTime time.Time
 }
+
+type Node struct {
+	ID         int64
+	Version    int16
+	PubKey     []byte
+	Alias      sql.NullString
+	LastUpdate sql.NullInt64
+	Color      sql.NullString
+	Signature  []byte
+}
+
+type NodeAddress struct {
+	NodeID   int64
+	Type     int16
+	Position int32
+	Address  string
+}
+
+type NodeExtraType struct {
+	NodeID int64
+	Type   int64
+	Value  []byte
+}
+
+type NodeFeature struct {
+	NodeID     int64
+	FeatureBit int32
+}