sqldb/sqlc: prune_log schema

Define the schema for the prune log.

Author: ellemouton

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

@@ -27,4 +27,5 @@ DROP TABLE IF EXISTS node_features;
 DROP TABLE IF EXISTS node_extra_types;
 DROP TABLE IF EXISTS nodes;
 DROP TABLE IF EXISTS channel_policy_extra_types;
-DROP TABLE IF EXISTS zombie_channels;
+DROP TABLE IF EXISTS zombie_channels;
+DROP TABLE IF EXISTS prune_log;

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

@@ -320,3 +320,15 @@ CREATE TABLE IF NOT EXISTS zombie_channels (
 );
 CREATE UNIQUE INDEX IF NOT EXISTS zombie_channels_channel_id_version_idx
     ON zombie_channels(scid, version);
+
+CREATE TABLE IF NOT EXISTS prune_log (
+    -- The block height that the prune was performed at.
+    -- NOTE: we don't use INTEGER PRIMARY KEY here since that would
+    -- get transformed into an auto-incrementing type by our SQL type
+    -- replacement logic. We don't want that since this must be the
+    -- actual block height and not an auto-incrementing value.
+    block_height BIGINT PRIMARY KEY,
+
+    -- The block hash that the prune was performed at.
+    block_hash BLOB NOT NULL
+);