feat: add --db-path CLI option and open SQLite db on startup

app/Main.hs

@@ -10,11 +10,13 @@ import Network.Wai.Handler.Warp qualified as Warp
 import Options.Applicative qualified as Opt
 import System.Posix.Signals qualified as Signals
 
+import Sis.Database qualified as Database
 import Sis.Server qualified as Sis
 
 data Options = Options
   { optPort :: Int
   , optStaticDir :: FilePath
+  , optDbPath :: FilePath
   }
 
 optionsParser :: Opt.Parser Options
@@ -36,6 +38,13 @@ optionsParser =
           <> Opt.value "frontend/dist"
           <> Opt.showDefault
       )
+    <*> Opt.strOption
+      ( Opt.long "db-path"
+          <> Opt.metavar "PATH"
+          <> Opt.help "Path to the SQLite database file"
+          <> Opt.value "data/sis.db"
+          <> Opt.showDefault
+      )
 
 main :: IO ()
 main = do
@@ -46,6 +55,8 @@ main = do
           <> Opt.progDesc "Sis — shared household chore tracker"
           <> Opt.header "sis-server"
 
+  _db <- Database.openDatabase (optDbPath opts)
+
   -- Install a SIGTERM handler so Docker stop works cleanly.
   _ <-
     Signals.installHandler