DB migration, proposals.

* DB schema is migrated.
* Added mechanism for proposing app improvements.

server/sql_schema/V1_init.sql

@@ -0,0 +1,25 @@
+CREATE TABLE users (
+  id integer PRIMARY KEY AUTOINCREMENT,
+  name text NOT NULL UNIQUE
+);
+INSERT INTO users(id, name) VALUES(0, 'system');
+
+CREATE TABLE features (
+  id integer PRIMARY KEY AUTOINCREMENT,
+  owner_id integer NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+  name text NOT NULL,
+  deadline text,
+  properties text NOT NULL,
+  geom text NOT NULL
+);
+
+CREATE TABLE feature_photos (
+  id integer PRIMARY KEY AUTOINCREMENT,
+  feature_id integer NOT NULL REFERENCES features(id) ON DELETE CASCADE,
+  thumbnail_content_type text NOT NULL,
+  content_type text NOT NULL,
+  thumbnail_contents blob NOT NULL,
+  contents blob NOT NULL
+);
+
+PRAGMA user_version = 1;

server/sql_schema/V2_proposals.sql

@@ -0,0 +1,7 @@
+CREATE TABLE proposals (
+  owner_id integer NOT NULL REFERENCES users(id) ON DELETE RESTRICT,
+  description text NOT NULL,
+  how text NOT NULL
+);
+
+PRAGMA user_version = 2;