add db migration tool

.idea/.idea.c3stream/.idea/contentModel.xml

@@ -53,6 +53,7 @@
         </e>
       </e>
       <e p="packages" t="ExcludeRecursive" />
+      <e p="v4_to_v5_migrator.sh" t="Include" />
       <e p="wwwroot" t="Include">
         <e p="css" t="Include">
           <e p="fa.css" t="Include" />

v4_to_v5_migrator.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+# Requires jq and sqlite3
+
+cp database.init.sqlite data/c3stream.sqlite
+
+rm migration.sql
+
+for row in $(cat "data/c3stream.user.json" | jq -c '.[]'); do
+   echo "INSERT INTO States (TalkId, UserId, State) VALUES ($(echo $row | jq '.TalkId'),$(echo $row | jq '.UserId'),$(echo $row | jq '.State'));" | tee -a migration.sql
+done
+
+cat migration.sql | sqlite3 data/c3stream.sqlite