feat: basic api & model for post

migrations/2022-03-11-065048_create_posts/down.sql

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+-- This file should undo anything in `up.sql`
+DROP TABLE posts

migrations/2022-03-11-065048_create_posts/up.sql

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+-- Your SQL goes here
+
+CREATE TABLE posts (
+  id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
+  author_hash VARCHAR NOT NULL,
+  content TEXT NOT NULL,
+  cw VARCHAR NOT NULL DEFAULT '',
+  author_title VARCHAR NOT NULL DEFAULT '',
+  n_likes INTEGER NOT NULL DEFAULT 0,
+  n_comments INTEGER NOT NULL DEFAULT 0,
+  create_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  last_comment_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  is_deleted BOOLEAN NOT NULL DEFAULT FALSE,
+  is_reported BOOLEAN NOT NULL DEFAULT FALSE,
+  hot_score INTEGER NOT NULL DEFAULT 0,
+  allow_search BOOLEAN NOT NULL DEFAULT ''
+);
+CREATE INDEX posts_last_comment_time_idx ON posts (`last_comment_time`);
+CREATE INDEX posts_hot_idx ON posts (`hot_score`)
+