feat(postgres): initial migrations

crates/adapters/postgres/migrations/003_new_tables.sql

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+CREATE TABLE IF NOT EXISTS likes (
+    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id    UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    thought_id UUID NOT NULL REFERENCES thoughts(id) ON DELETE CASCADE,
+    ap_id      TEXT UNIQUE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (user_id, thought_id)
+);
+
+CREATE TABLE IF NOT EXISTS boosts (
+    id         UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id    UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    thought_id UUID NOT NULL REFERENCES thoughts(id) ON DELETE CASCADE,
+    ap_id      TEXT UNIQUE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (user_id, thought_id)
+);
+
+CREATE TABLE IF NOT EXISTS blocks (
+    blocker_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    blocked_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (blocker_id, blocked_id)
+);
+
+CREATE TABLE IF NOT EXISTS remote_actors (
+    url              TEXT PRIMARY KEY,
+    handle           TEXT NOT NULL,
+    display_name     TEXT,
+    inbox_url        TEXT NOT NULL,
+    shared_inbox_url TEXT,
+    public_key       TEXT NOT NULL,
+    last_fetched_at  TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE TABLE IF NOT EXISTS notifications (
+    id           UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    user_id      UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    type         TEXT NOT NULL,
+    from_user_id UUID REFERENCES users(id) ON DELETE SET NULL,
+    thought_id   UUID REFERENCES thoughts(id) ON DELETE CASCADE,
+    read         BOOLEAN NOT NULL DEFAULT false,
+    created_at   TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_thoughts_user_id ON thoughts(user_id);
+CREATE INDEX IF NOT EXISTS idx_thoughts_created_at ON thoughts(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_follows_following_id ON follows(following_id);
+CREATE INDEX IF NOT EXISTS idx_notifications_user_id ON notifications(user_id, read);