feat(db): corrected tables

Signed-off-by: SoXX <soxx@fenpa.ws>

pkg/database/migrations/001_inital_database.sql

@@ -17,14 +17,14 @@ CREATE TYPE TagType AS ENUM (
 
 CREATE TABLE "Post"
 (
-    id         VARCHAR(25) PRIMARY KEY,
+    id         VARCHAR(25) UNIQUE PRIMARY KEY,
     rating     Rating,
-    created_at TIMESTAMP
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 );
 
 CREATE TABLE "Source"
 (
-    id           VARCHAR(25) PRIMARY KEY,
+    id VARCHAR(25) UNIQUE PRIMARY KEY,
     display_name TEXT,
     domain       TEXT NOT NULL UNIQUE
 );
@@ -37,8 +37,8 @@ CREATE TABLE "Tag"
 
 CREATE TABLE "User"
 (
-    id         TEXT PRIMARY KEY,
-    created_at TIMESTAMP
+    id         TEXT UNIQUE PRIMARY KEY,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 );
 
 CREATE TABLE "PostReference"
@@ -66,7 +66,7 @@ CREATE TABLE "UserFavorites"
 (
     user_id    TEXT REFERENCES "User" (id),
     post_id    TEXT REFERENCES "Post" (id),
-    created_at TIMESTAMP,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
     PRIMARY KEY (user_id, post_id)
 );