Initial commit: Sproutlink short URL system

migrations/0001_init.sql

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+-- Sequence table: single-row counter for short link code generation
+CREATE TABLE IF NOT EXISTS link_seq (
+  id      INTEGER PRIMARY KEY CHECK (id = 1),
+  next_id INTEGER NOT NULL DEFAULT 0
+);
+INSERT OR IGNORE INTO link_seq (id, next_id) VALUES (1, 0);
+
+-- Short links table
+CREATE TABLE IF NOT EXISTS short_links (
+  id            INTEGER  PRIMARY KEY AUTOINCREMENT,
+  code          TEXT     UNIQUE NOT NULL,
+  target_url    TEXT     NOT NULL,
+  expires_at    INTEGER  NULL,       -- Unix seconds, NULL = never expires
+  max_clicks    INTEGER  NULL,       -- NULL = unlimited
+  clicks        INTEGER  NOT NULL DEFAULT 0,
+  password_hash TEXT     NULL,       -- NULL = no password; format: "pbkdf2:<salt>:<hash>"
+  deleted       INTEGER  NOT NULL DEFAULT 0,
+  created_at    INTEGER  NOT NULL,
+  updated_at    INTEGER  NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_short_links_code ON short_links (code);
+CREATE INDEX IF NOT EXISTS idx_short_links_expires ON short_links (expires_at) WHERE expires_at IS NOT NULL;

migrations/0002_client_rule.sql

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+ALTER TABLE short_links ADD COLUMN client_rule TEXT NULL;

migrations/0002_page_views.sql

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+-- Cumulative page views (SPA: POST /api/pv increments)
+CREATE TABLE IF NOT EXISTS app_stats (
+  id INTEGER PRIMARY KEY CHECK (id = 1),
+  page_views INTEGER NOT NULL DEFAULT 0
+);
+INSERT OR IGNORE INTO app_stats (id, page_views) VALUES (1, 0);

migrations/0003_ip_rule.sql

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+ALTER TABLE short_links ADD COLUMN ip_rule TEXT NULL;