sqldb+graphdb: SQL methods for Node CRUD

In this commit, we add the various sqlc queries that we need in order
to implement the following V1Store methods:

- AddLightningNode
- FetchLightningNode
- HasLightningNode
- AddrsForNode
- DeleteLightningNode
- FetchNodeFeatures

These are implemented by SQLStore which then lets us use the SQLStore
backend for the following unit tests:

- TestNodeInsertionAndDeletion
- TestLightningNodePersistence

sqldb/sqlc/queries/graph.sql

@@ -0,0 +1,112 @@
+/* ─────────────────────────────────────────────
+   nodes table queries
+   ─────────────────────────────────────────────
+*/
+
+-- name: UpsertNode :one
+INSERT INTO nodes (
+    version, pub_key, alias, last_update, color, signature
+) VALUES (
+    $1, $2, $3, $4, $5, $6
+)
+ON CONFLICT (pub_key, version)
+    -- Update the following fields if a conflict occurs on pub_key
+    -- and version.
+    DO UPDATE SET
+        alias = EXCLUDED.alias,
+        last_update = EXCLUDED.last_update,
+        color = EXCLUDED.color,
+        signature = EXCLUDED.signature
+WHERE EXCLUDED.last_update > nodes.last_update
+RETURNING id;
+
+-- name: GetNodeByPubKey :one
+SELECT *
+FROM nodes
+WHERE pub_key = $1
+  AND version = $2;
+
+-- name: DeleteNodeByPubKey :execresult
+DELETE FROM nodes
+WHERE pub_key = $1
+  AND version = $2;
+
+/* ─────────────────────────────────────────────
+   node_features table queries
+   ─────────────────────────────────────────────
+*/
+
+-- name: InsertNodeFeature :exec
+INSERT INTO node_features (
+    node_id, feature_bit
+) VALUES (
+    $1, $2
+);
+
+-- name: GetNodeFeatures :many
+SELECT *
+FROM node_features
+WHERE node_id = $1;
+
+-- name: GetNodeFeaturesByPubKey :many
+SELECT f.feature_bit
+FROM nodes n
+    JOIN node_features f ON f.node_id = n.id
+WHERE n.pub_key = $1
+  AND n.version = $2;
+
+-- name: DeleteNodeFeature :exec
+DELETE FROM node_features
+WHERE node_id = $1
+  AND feature_bit = $2;
+
+/* ─────────────────────────────────────────────
+   node_addresses table queries
+   ─────────────────────────────────────────────
+*/
+
+-- name: InsertNodeAddress :exec
+INSERT INTO node_addresses (
+    node_id,
+    type,
+    address,
+    position
+) VALUES (
+    $1, $2, $3, $4
+ );
+
+-- name: GetNodeAddressesByPubKey :many
+SELECT a.type, a.address
+FROM nodes n
+LEFT JOIN node_addresses a ON a.node_id = n.id
+WHERE n.pub_key = $1 AND n.version = $2
+ORDER BY a.type ASC, a.position ASC;
+
+-- name: DeleteNodeAddresses :exec
+DELETE FROM node_addresses
+WHERE node_id = $1;
+
+/* ─────────────────────────────────────────────
+   node_extra_types table queries
+   ─────────────────────────────────────────────
+*/
+
+-- name: UpsertNodeExtraType :exec
+INSERT INTO node_extra_types (
+    node_id, type, value
+)
+VALUES ($1, $2, $3)
+ON CONFLICT (type, node_id)
+    -- Update the value if a conflict occurs on type
+    -- and node_id.
+    DO UPDATE SET value = EXCLUDED.value;
+
+-- name: GetExtraNodeTypes :many
+SELECT *
+FROM node_extra_types
+WHERE node_id = $1;
+
+-- name: DeleteExtraNodeType :exec
+DELETE FROM node_extra_types
+WHERE node_id = $1
+  AND type = $2;