diff --git a/LICENSE b/LICENSE
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+++ b/LICENSE
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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
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+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
+
diff --git a/app/Main.hs b/app/Main.hs
new file mode 100644
--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,67 @@
+module Main where
+
+import Control.Monad
+import Data.Maybe
+import Data.Text.IO qualified as TIO
+import Data.Time.Format
+import Options.Applicative qualified as Cli
+import System.Exit
+import Text.Megaparsec (errorBundlePretty)
+
+import Caliper.Cli
+import Caliper.Syntax
+
+main :: IO ()
+main = do
+  args@(CliArgs {filepaths, action}) <- Cli.execParser cliParser
+  parseResults <- traverse parseAndResolve filepaths
+
+  let (parseFailures, parseOkWithSemErrs) = foldr g ([], []) parseResults
+        where
+          g (src, Right ok) (bad, good) = (bad, (src, ok) : good)
+          g (_, Left err) (bad, good) = (err : bad, good)
+
+  unless (null parseFailures) $ do
+    forM_ parseFailures $ putStrLn . errorBundlePretty
+    exitWith $ ExitFailure 1
+
+  let (semErrs, outputs) = foldr g ([], []) parseOkWithSemErrs
+        where
+          g (_, ([], out)) (bad, good) = (bad, out : good)
+          g (src, (errs, _)) (bad, good) = ((src, errs) : bad, good)
+
+  unless (null semErrs) $ do
+    forM_ semErrs $ \(src, errs) ->
+      forM_ errs $ \err ->
+        TIO.putStrLn $ resolutionErrorPretty src err
+    exitWith $ ExitFailure 1
+
+  let mergedOutputs =
+        applyCliArgs args $
+          sortResolvedEntriesAbsolute $
+            mconcat $
+              outputs
+  ( case action of
+      Summation sumArgs -> handleSummation sumArgs
+      Histogram -> handleHistogram
+    )
+    mergedOutputs
+
+handleSummation :: SummationArgs -> [ResolvedEntry] -> IO ()
+handleSummation (SummationArgs {summationFormat}) output = do
+  let durationFormat = fromMaybe "%hh %Mm %Ss" summationFormat
+      duration = sumDuration output
+  putStrLn $ formatTime defaultTimeLocale durationFormat duration
+
+handleHistogram :: [ResolvedEntry] -> IO ()
+handleHistogram output = do
+  let dailyEntries' = groupEntriesByDay output
+
+  forM_ dailyEntries' $ \entriesOfDay -> do
+    putStrLn $ histogramLine entriesOfDay
+
+applyCliArgs :: CliArgs -> [ResolvedEntry] -> [ResolvedEntry]
+applyCliArgs (CliArgs {filters, begin, end}) =
+  maybe id entriesAfter begin
+    . maybe id entriesBefore end
+    . filterByTags filters
diff --git a/caliper.cabal b/caliper.cabal
new file mode 100644
--- /dev/null
+++ b/caliper.cabal
@@ -0,0 +1,88 @@
+cabal-version: 3.0
+name: caliper
+version: 0.1.0.0
+category: CLI
+
+synopsis:
+  A time tracker that is way too precise.
+
+description:
+  Reads from caliper format and can generate histogram and time summation.
+  Supports query syntax to filter entries.
+
+author:        Léana 江
+maintainer:    leana.jiang@icloud.com
+
+license: GPL-3.0-or-later
+license-files: ./LICENSE
+
+extra-source-files:
+  -- golden test files
+  ./test/data/**/*.clp
+  ./test/data/**/*.expr
+
+common common
+  default-language:   GHC2021
+  default-extensions:
+    OverloadedStrings
+
+  ghc-options:
+    -Wall -Wcompat -Widentities -Wincomplete-record-updates
+    -Wincomplete-patterns -Wincomplete-uni-patterns
+    -Wredundant-constraints -Werror=missing-fields
+
+  build-depends:      base >=4 && <5
+
+library caliper-lib
+  import:          common
+  hs-source-dirs:  src
+  exposed-modules:
+    Caliper.Cli
+    Caliper.Cli.Parsing
+    Caliper.Cli.Printing
+    Caliper.Syntax
+    Caliper.Syntax.Ast
+    Caliper.Syntax.Parsing
+    Caliper.Syntax.Position
+    Caliper.Syntax.Resolution
+    Caliper.Syntax.Transform
+
+  build-depends:
+    , containers            >=0.6.8     && <0.8
+    , deepseq               >=1.5       && <2
+    , filepath              >=1.4.100.3 && <1.5.4
+    , megaparsec            >=9.5       && <9.7
+    , optparse-applicative  >=0.15      && <0.19
+    , text                  >=2.1.2     && <2.1.3
+    , time                  >=1.9       && <1.15
+    , transformers          >=0.5.6     && <0.6.3
+
+executable caliper
+  import:         common
+  hs-source-dirs: app/
+  main-is:        Main.hs
+  build-depends:
+    , megaparsec            >=9.5   && <9.7
+    , optparse-applicative  >=0.15  && <0.19
+    , caliper-lib
+    , text                  >=2.1.2 && <2.1.3
+    , time                  >=1.9   && <1.15
+
+  other-modules:
+
+test-suite caliper-spec
+  import:         common
+  type:           exitcode-stdio-1.0
+  main-is:        Main.hs
+  hs-source-dirs: test
+  other-modules:  Data.TreeDiff.Instances.Caliper
+  build-depends:
+    , containers    >=0.6.8     && <0.8
+    , filepath      >=1.4.100.3 && <1.5.4
+    , megaparsec    >=9.5       && <9.7
+    , caliper-lib
+    , tasty         >=1.4.2.2   && <1.5.3
+    , tasty-golden  >=2.3.1.1   && <2.3.5
+    , text          >=2.1.2     && <2.1.3
+    , time          >=1.9       && <1.15
+    , tree-diff     >=0.3.1     && <0.3.4
diff --git a/src/Caliper/Cli.hs b/src/Caliper/Cli.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Cli.hs
@@ -0,0 +1,8 @@
+module Caliper.Cli (
+  module Caliper.Cli.Parsing,
+  module Caliper.Cli.Printing,
+)
+where
+
+import Caliper.Cli.Parsing
+import Caliper.Cli.Printing
diff --git a/src/Caliper/Cli/Parsing.hs b/src/Caliper/Cli/Parsing.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Cli/Parsing.hs
@@ -0,0 +1,109 @@
+{-# LANGUAGE ApplicativeDo #-}
+{-# LANGUAGE RecordWildCards #-}
+
+module Caliper.Cli.Parsing where
+
+import Control.Applicative
+import Data.List.NonEmpty qualified as NE
+import Data.Text qualified as T
+import Data.Time.Calendar
+import Data.Time.LocalTime
+import Options.Applicative qualified as Cli
+import Text.Read
+
+import Caliper.Syntax
+
+data CliArgs = CliArgs
+  { action :: CliAction
+  , filepaths :: NE.NonEmpty String
+  , filters :: [TagPredicate]
+  , begin :: Maybe LocalTime
+  , end :: Maybe LocalTime
+  }
+
+data CliAction
+  = Summation SummationArgs
+  | Histogram
+
+newtype SummationArgs = SummationArgs
+  { summationFormat :: Maybe String
+  }
+
+cliParser :: Cli.ParserInfo CliArgs
+cliParser = Cli.info subcommands (Cli.progDesc "Track the amount of work time you have done")
+  where
+    subcommands :: Cli.Parser CliArgs
+    subcommands =
+      (Cli.helper <*>) $
+        Cli.subparser
+          ( Cli.command
+              "sum"
+              (Cli.info (parseCommonCommandWith summationArgsP) (Cli.progDesc "Sum the amount of work time"))
+              <> Cli.command
+                "histogram"
+                (Cli.info (parseCommonCommandWith (pure Histogram)) (Cli.progDesc "Show a histogram"))
+          )
+
+    summationArgsP :: Cli.Parser CliAction
+    summationArgsP = do
+      fmt <- optional formatP
+      pure $ Summation (SummationArgs fmt)
+
+    formatP :: Cli.Parser String
+    formatP =
+      Cli.strOption $
+        Cli.long "format"
+          <> Cli.metavar "FORMAT"
+          <> Cli.help "Format of the output time, defaults to \"%hh %Mm %Ss\""
+
+    parseCommonCommandWith :: Cli.Parser CliAction -> Cli.Parser CliArgs
+    parseCommonCommandWith actionP =
+      Cli.helper <*> do
+        filepaths <-
+          NE.some1 $
+            Cli.strArgument $
+              Cli.metavar "FILE"
+                <> Cli.help "Path to the timetrack file"
+
+        action <- actionP
+
+        begin <-
+          optional $
+            Cli.option localTimeReader $
+              Cli.long "begin"
+                <> Cli.short 'b'
+                <> Cli.metavar "BEGIN"
+                <> Cli.help "Truncate operation from a given moment"
+
+        end <-
+          optional $
+            Cli.option localTimeReader $
+              Cli.long "end"
+                <> Cli.short 'e'
+                <> Cli.metavar "END"
+                <> Cli.help "Truncate operation to a given moment"
+
+        filters <-
+          many . Cli.option keyValueReader $
+            Cli.metavar "QUERY"
+              <> Cli.short 'q'
+              <> Cli.long "query"
+              <> Cli.help "A \"key:value\" pair to constraint the result"
+
+        pure $ CliArgs {..}
+
+    localTimeReader :: Cli.ReadM LocalTime
+    localTimeReader = Cli.maybeReader $ \x ->
+      let readDay :: Maybe Day
+          readDay = readMaybe x
+          readLocalTime :: Maybe LocalTime
+          readLocalTime = readMaybe x
+      in  readLocalTime <|> (LocalTime <$> readDay <*> pure (TimeOfDay 0 0 0))
+
+    keyValueReader :: Cli.ReadM TagPredicate
+    keyValueReader =
+      let f s = case break (== ':') s of
+            ("not", ':' : s') -> Negate <$> f s'
+            (k, ':' : v) -> Just $ HasKeyValue (T.pack k) (T.pack v)
+            _ -> Nothing
+      in  Cli.maybeReader f
diff --git a/src/Caliper/Cli/Printing.hs b/src/Caliper/Cli/Printing.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Cli/Printing.hs
@@ -0,0 +1,94 @@
+module Caliper.Cli.Printing where
+
+import Data.Function ((&))
+import Data.List ((!?))
+import Data.List.NonEmpty qualified as NE
+import Data.Maybe
+import Data.Text qualified as T
+import Data.Time.LocalTime
+
+import Caliper.Syntax
+
+{- | Precondition: entries must be all of the same day
+Each + symbol is a quarter of an hour, a dot is anything less than a quarter.
+-}
+histogramLine :: NE.NonEmpty ResolvedEntry -> String
+histogramLine es =
+  let spnSeconds :: Rational
+      spnSeconds = realToFrac (sumDuration $ NE.toList es)
+      spnQuarterOfHour :: Rational
+      spnQuarterOfHour = (/ 15) $ (/ 60) spnSeconds
+
+      go :: Rational -> String
+      go 0 = ""
+      go n
+        | n < 1 = "."
+        | n <= 1 = "+"
+        | n <= 2 = "++"
+        | n <= 3 = "+++"
+        | n <= 4 = "+++$"
+        | otherwise = go 4 <> go (n - 4)
+  in  show (localDay $ zonedTimeToLocalTime d)
+        <> " "
+        <> show (zonedTimeZone d)
+        <> " | "
+        <> go spnQuarterOfHour
+  where
+    d = entryStart $ NE.head es
+
+-- TODO: parameterize to show more context on demand
+withFencedHelp :: T.Text -> SrcSpan -> T.Text -> T.Text
+withFencedHelp src (SrcSpan fname startPos endPos) message =
+  let SrcPosition startLine startCol = startPos
+      SrcPosition _ endCol = endPos
+
+      srcLines :: [T.Text]
+      srcLines = T.lines src
+
+      header :: T.Text
+      header = fname <> ":" <> lineNumber <> ":"
+
+      lineNumber :: T.Text
+      lineNumber = T.show startLine
+      emptyLineNumber :: T.Text
+      emptyLineNumber = T.replicate (T.length lineNumber) " "
+
+      mkLine :: Int -> T.Text
+      mkLine n =
+        let numberingOrEmpty :: T.Text
+            numberingOrEmpty = if n == startLine then lineNumber else emptyLineNumber
+            maybeContent :: T.Text
+            maybeContent = fromMaybe "" $ srcLines !? (n - 1)
+        in  numberingOrEmpty <> " | " <> maybeContent
+
+      undercurl :: T.Text
+      undercurl = emptyLineNumber <> " | " <> T.replicate (startCol - 1) " " <> T.replicate (endCol - startCol) "^"
+  in  message
+        <> "\n"
+        <> T.unlines
+          [ header
+          , mkLine $ startLine - 1
+          , mkLine startLine
+          , undercurl
+          , mkLine $ startLine + 1
+          ]
+
+resolutionErrorPretty :: T.Text -> ResolutionError -> T.Text
+resolutionErrorPretty src (ResolutionError kind spn) = case kind of
+  NegativeTimeSpan duration ->
+    "user error: Timespan has negative or null duration of " <> T.show duration
+      & withFencedHelp src spn
+  InvalidTime t ->
+    "user error: time " <> quote t <> " is a not valid date time"
+      & withFencedHelp src spn
+  UndeclaredType ty ->
+    "user error: event has undeclared type " <> quote ty
+      & withFencedHelp src spn
+  DuplicatedType ty ty2 ->
+    "user error: event has duplicate types "
+      <> quote ty2
+      <> " while it already bears the type "
+      <> quote ty
+      & withFencedHelp src spn
+  where
+    quote s = "\"" <> s <> "\""
diff --git a/src/Caliper/Syntax.hs b/src/Caliper/Syntax.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Syntax.hs
@@ -0,0 +1,14 @@
+module Caliper.Syntax (
+  module Caliper.Syntax.Ast,
+  module Caliper.Syntax.Resolution,
+  module Caliper.Syntax.Position,
+  module Caliper.Syntax.Parsing,
+  module Caliper.Syntax.Transform,
+)
+where
+
+import Caliper.Syntax.Ast
+import Caliper.Syntax.Parsing
+import Caliper.Syntax.Position
+import Caliper.Syntax.Resolution
+import Caliper.Syntax.Transform
diff --git a/src/Caliper/Syntax/Ast.hs b/src/Caliper/Syntax/Ast.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Syntax/Ast.hs
@@ -0,0 +1,55 @@
+{-# LANGUAGE DeriveGeneric #-}
+
+module Caliper.Syntax.Ast where
+
+import Control.DeepSeq
+import Data.Function
+import Data.List.NonEmpty qualified as NE
+import Data.Map qualified as M
+import Data.Text qualified as T
+import Data.Time.Clock
+import Data.Time.LocalTime
+import GHC.Generics
+
+import Caliper.Syntax.Position
+
+-- TODO: (not urgent) not export the accessor and constructor
+
+data RawAst = RawAst
+  { rawAstCurrentFilePath :: T.Text {- FilePath -}
+  , rawAstTypeDecls :: [T.Text]
+  -- ^ type declarations
+  , rawAstEntriesOrTZ :: [EntriesOrTZ]
+  }
+  deriving (Show, Generic)
+
+instance NFData RawAst
+
+data EntriesOrTZ
+  = -- | allow user to specify a timezone to interpret the following entries
+    TZDecl TimeZone
+  | RawEntries [RawEntry]
+  deriving (Show, Generic)
+
+instance NFData EntriesOrTZ
+
+-- | Parsed data structure from the parser
+data RawEntry = RawEntry
+  { rawEntryStart :: LocalTime
+  , rawEntryEnd :: (LocalTime, SrcSpan)
+  , rawEntryMetadata :: M.Map T.Text (NE.NonEmpty (T.Text, SrcSpan))
+  }
+  deriving (Show, Generic)
+
+instance NFData RawEntry
+
+-- | Entry resolved enriched data
+data ResolvedEntry = ResolvedEntry
+  { entryStart :: ZonedTime
+  , entryEnd :: ZonedTime
+  , entryMetadata :: M.Map T.Text (NE.NonEmpty T.Text)
+  }
+  deriving (Show, Generic)
+
+entrySpan :: ResolvedEntry -> NominalDiffTime
+entrySpan e = (diffLocalTime `on` zonedTimeToLocalTime) (entryEnd e) (entryStart e)
diff --git a/src/Caliper/Syntax/Parsing.hs b/src/Caliper/Syntax/Parsing.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Syntax/Parsing.hs
@@ -0,0 +1,195 @@
+module Caliper.Syntax.Parsing where
+
+import Control.DeepSeq
+import Control.Monad
+import Data.Bifunctor qualified as Bi
+import Data.Char
+import Data.Function
+import Data.List.NonEmpty qualified as NE
+import Data.Map qualified as M
+import Data.Text qualified as T
+import Data.Time.Calendar
+import Data.Time.LocalTime
+import Data.Void
+import Text.Megaparsec hiding (ParseError)
+import Text.Megaparsec.Char
+
+import Caliper.Syntax.Ast
+import Caliper.Syntax.Position
+
+type Parser = Parsec Void T.Text
+
+drainLine :: Parser prefix -> Parser ()
+drainLine p = do
+  _ <- many (p & consumeCommentBlock)
+  -- Think of sequence as products, failure is mzero and would make the entire chain 0.
+  -- Here, if there are some spaces followed by something /not eol/, eol would fail.
+  -- This would make entire part fail whilst hspace has consumed some space.
+  -- We then backtrack the parser in such case.
+  _ <- (p & consumeCommentLine) <|> try (hspace *> void eol)
+  pure ()
+
+consumeCommentBlock :: Parser prefix -> Parser ()
+consumeCommentBlock p = hidden $ do
+  _ <- try $ p *> "{-"
+  _ <- manyTill (nested <|> void anySingle) (void "-}")
+  pure ()
+  where
+    nested = pure () & consumeCommentBlock
+
+consumeCommentLine :: Parser prefix -> Parser ()
+consumeCommentLine p = hidden $ do
+  _ <- try $ p *> "--"
+  _ <- manyTill anySingle (void eol <|> eof)
+  pure ()
+
+caliperAst :: Parser RawAst
+caliperAst =
+  many (pure () & drainLine)
+    *> ( RawAst
+           <$> (T.pack . sourceName <$> getSourcePos)
+           <*> typeDecls
+           <*> entriesOrTZ
+       )
+    <* eof
+
+typeDecls :: Parser [T.Text]
+typeDecls = typeDecl `sepEndBy` many (hspace & drainLine)
+
+typeDecl :: Parser T.Text
+typeDecl = label "type declaration" $ do
+  _ <- "type" *> hspace1
+  t <- T.pack <$> some valueChar
+  _ <- hspace & drainLine
+  pure t
+
+entriesOrTZ :: Parser [EntriesOrTZ]
+entriesOrTZ =
+  many $
+    (RawEntries <$> entries)
+      <|> (TZDecl <$> tzDecl)
+
+entries :: Parser [RawEntry]
+entries = entry `sepEndBy1` many (hspace & drainLine)
+
+tzDecl :: Parser TimeZone
+tzDecl = do
+  _ <- "timezone" *> hspace1
+  sign <- (-1) <$ char '-' <|> 1 <$ char '+' <|> pure 1
+  hh <- (try (decimalOfLength 2) <|> decimalOfLength 1) <* sep
+  mm <- decimalOfLength 2
+  _ <- many (hspace & drainLine)
+  pure $ TimeZone (sign * (hh * 60 + mm)) False ""
+  where
+    sep :: Parser Char
+    sep = satisfy (not . isDigit) <?> "non-digit separator"
+
+entry :: Parser RawEntry
+entry = label "entry" $ do
+  entryStart <- localTime
+  _ <- sep *> "..." <* sep
+  entryEnd <- localTime
+  _ <- hspace & drainLine -- End of line comment
+  tags <-
+    many (hspace & drainLine) -- Leading inner comment
+      *> metadata
+
+  -- This part creates thunk build-up, force the thunk here
+  let re =
+        RawEntry
+          { rawEntryStart = fst entryStart
+          , rawEntryEnd = entryEnd
+          , rawEntryMetadata = tags
+          }
+  re `deepseq` pure re
+  where
+    sep :: Parser ()
+    sep = void $ many go
+      where
+        go = hspace1 <|> (pure () & consumeCommentBlock)
+
+-- | A time in the format of yyyy-mm-dd-hh-mm-ss, where dashes are a single non digit separator.
+localTime :: Parser (LocalTime, SrcSpan)
+localTime = do
+  mkSrcSpan <- srcSpan
+  startPos <- srcPosition
+  t <- LocalTime <$> (parseDay <* sep) <*> parseTime
+  endPos <- srcPosition
+  pure (t, mkSrcSpan startPos endPos)
+  where
+    sep :: Parser Char
+    sep = satisfy (not . isDigit) <?> "non-digit separator"
+
+    parseDay :: Parser Day
+    parseDay = do
+      backtrack <- getOffset
+      yyyy <- decimalOfLength 4 <* sep
+      mm <- decimalOfLength 2 <* sep
+      dd <- decimalOfLength 2
+      case fromGregorianValid yyyy mm dd of
+        Nothing -> do
+          setOffset backtrack
+          unexpected (Label $ 'i' NE.:| "nvalid calendar date")
+        Just x -> pure x
+
+    parseTime :: Parser TimeOfDay
+    parseTime = do
+      backtrack <- getOffset
+      hh <- decimalOfLength 2 <* sep
+      mm <- decimalOfLength 2 <* sep
+      ss <- (decimalOfLength 2) <|> (0 <$ "__") -- unknown second notation
+      case makeTimeOfDayValid hh mm ss of
+        Nothing -> do
+          setOffset backtrack
+          unexpected (Label $ 'i' NE.:| "nvalid time")
+        Just x -> pure x
+
+decimalOfLength :: Num a => Int -> Parser a
+decimalOfLength = fmap (fromIntegral . foldl' go 0) . flip replicateM (satisfy isDigit)
+  where
+    go :: Int -> Char -> Int
+    go acc x = acc * 10 + fromEnum x - fromEnum '0'
+
+metadata :: Parser (M.Map T.Text (NE.NonEmpty (T.Text, SrcSpan)))
+metadata =
+  finalize
+    . M.fromListWith (<>)
+    . nonEmptyValue
+    <$> (hspace1 & keyValuePair) `sepEndBy` many (hspace & drainLine)
+  where
+    finalize = fmap NE.reverse
+
+    nonEmptyValue :: [(a, b)] -> [(a, NE.NonEmpty b)]
+    nonEmptyValue = map (Bi.second pure)
+
+keyValuePair :: Parser prefix -> Parser (T.Text, (T.Text, SrcSpan))
+keyValuePair p = do
+  mkSrcSpan <- srcSpan
+  (startPos, k) <- try $ do
+    _ <- p
+    liftA2 (,) srcPosition (T.pack <$> some keyChar)
+  _ <- single ':'
+  v <- T.pack <$> some valueChar
+  endPos <- srcPosition
+  let spn = mkSrcSpan startPos endPos
+  pure (k, (v, spn))
+
+keyChar :: Parser Char
+keyChar = letterChar
+
+valueChar :: Parser Char
+valueChar = alphaNumChar <|> char '\'' -- we haskellers gotta allow ' in names
+
+srcSpan :: Parser (SrcPosition -> SrcPosition -> SrcSpan)
+srcSpan = do
+  SourcePos {sourceName = fname} <- getSourcePos
+  pure (SrcSpan (T.pack fname))
+
+srcPosition :: Parser SrcPosition
+srcPosition = do
+  SourcePos
+    { sourceLine = l
+    , sourceColumn = c
+    } <-
+    getSourcePos
+  pure (SrcPosition (unPos l) (unPos c))
diff --git a/src/Caliper/Syntax/Position.hs b/src/Caliper/Syntax/Position.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Syntax/Position.hs
@@ -0,0 +1,19 @@
+{-# LANGUAGE DeriveGeneric #-}
+
+module Caliper.Syntax.Position where
+
+import Control.DeepSeq
+import Data.Text qualified as T
+import GHC.Generics
+
+-- | Line, column
+data SrcPosition = SrcPosition !Int !Int
+  deriving (Show, Generic)
+
+instance NFData SrcPosition
+
+-- TODO: don't save this path multiple times, read from the bigger AST
+data SrcSpan = SrcSpan T.Text {-FilePath-} SrcPosition SrcPosition
+  deriving (Show, Generic)
+
+instance NFData SrcSpan
diff --git a/src/Caliper/Syntax/Resolution.hs b/src/Caliper/Syntax/Resolution.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Syntax/Resolution.hs
@@ -0,0 +1,121 @@
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE ViewPatterns #-}
+
+module Caliper.Syntax.Resolution where
+
+import Control.Monad
+import Control.Monad.Trans.State.Strict
+import Data.Either
+import Data.List (sortOn)
+import Data.List.NonEmpty qualified as NE
+import Data.Map qualified as M
+import Data.Maybe
+import Data.Text qualified as T
+import Data.Text.IO qualified as TIO
+import Data.Time.Clock
+import Data.Time.LocalTime
+import Data.Void
+import GHC.Generics
+import Text.Megaparsec hiding (ParseError, State)
+
+import Caliper.Syntax.Ast
+import Caliper.Syntax.Parsing
+import Caliper.Syntax.Position
+
+-- | Necessary information to emit a helpful error
+data ResolutionError = ResolutionError ResolutionErrorKind SrcSpan
+  deriving (Show, Generic)
+
+data ResolutionErrorKind
+  = -- | fail when time span is negative
+    NegativeTimeSpan NominalDiffTime
+  | InvalidTime T.Text
+  | UndeclaredType T.Text
+  | DuplicatedType T.Text T.Text
+  deriving (Show, Generic)
+
+data ResolveState = ResolveState
+  { rsTimezone :: Maybe TimeZone
+  -- ^ Timezone as it was last seen
+  }
+initialResolveState :: ResolveState
+initialResolveState =
+  ResolveState
+    { rsTimezone = Nothing
+    }
+
+type ResolveResult = ([ResolutionError], [ResolvedEntry])
+
+parseAndResolve
+  :: FilePath
+  -> IO
+       ( T.Text
+       , Either (ParseErrorBundle T.Text Void) ResolveResult
+       )
+parseAndResolve filepath = do
+  content <- TIO.readFile filepath
+  let parsedRes = runParser caliperAst filepath content
+  pure
+    ( content
+    , resolve <$> parsedRes
+    )
+
+resolve :: RawAst -> ResolveResult
+resolve ast = evalState (resolve' ast) initialResolveState
+
+resolve' :: RawAst -> State ResolveState ResolveResult
+resolve' ast = fmap sortResolvedEntriesAbsolute . mconcat <$> traverse go (rawAstEntriesOrTZ ast)
+  where
+    go (RawEntries es) = do
+      maybeTZ <- gets rsTimezone
+      pure $ resolveEntries (rawAstTypeDecls ast) maybeTZ es
+    go (TZDecl tzStr) = do
+      put ResolveState {rsTimezone = Just tzStr}
+      pure mempty
+
+sortResolvedEntriesAbsolute :: [ResolvedEntry] -> [ResolvedEntry]
+sortResolvedEntriesAbsolute = sortOn (zonedTimeToUTC . entryStart)
+
+-- | Postcondition: the entries are sortied
+resolveEntries
+  :: [T.Text]
+  -> Maybe TimeZone
+  -> [RawEntry]
+  -> ([ResolutionError], [ResolvedEntry])
+resolveEntries typeDeclarations maybeTZ =
+  partitionEithers . map (resolveEntry typeDeclarations maybeTZ)
+
+-- TODO: maybe add a warning for zero spans?
+resolveEntry
+  :: [T.Text]
+  -> Maybe TimeZone
+  -> RawEntry
+  -> Either ResolutionError ResolvedEntry
+resolveEntry typeDeclarations maybeTZ (RawEntry {..}) = do
+  let spn :: NominalDiffTime
+      spn = fst rawEntryEnd `diffLocalTime` rawEntryStart
+  when (spn <= 0) $
+    Left $
+      ResolutionError (NegativeTimeSpan spn) (snd rawEntryEnd)
+  tagOk <- checkTypeUnicity rawEntryMetadata
+
+  ResolvedEntry
+    <$> (toZonedTime rawEntryStart)
+    <*> (toZonedTime $ fst rawEntryEnd)
+    <*> (pure (fmap fst <$> tagOk))
+  where
+    checkTypeUnicity
+      :: M.Map T.Text (NE.NonEmpty (T.Text, SrcSpan))
+      -> Either ResolutionError (M.Map T.Text (NE.NonEmpty (T.Text, SrcSpan)))
+    checkTypeUnicity m = case m M.!? "type" of
+      Nothing -> Right m
+      Just types -> case types of
+        (ty, pos) NE.:| [] ->
+          if (not . null) typeDeclarations -- If no type is declared, disable undeclared type checking
+            && ty `elem` typeDeclarations
+            then Right m
+            else Left $ ResolutionError (UndeclaredType ty) pos
+        (ty, _) NE.:| ((ty2, pos2) : _) -> Left $ ResolutionError (DuplicatedType ty ty2) pos2
+
+    toZonedTime :: LocalTime -> Either ResolutionError ZonedTime
+    toZonedTime t = pure $ ZonedTime t (fromMaybe utc maybeTZ) -- TODO: make an error for this?
diff --git a/src/Caliper/Syntax/Transform.hs b/src/Caliper/Syntax/Transform.hs
new file mode 100644
--- /dev/null
+++ b/src/Caliper/Syntax/Transform.hs
@@ -0,0 +1,46 @@
+module Caliper.Syntax.Transform where
+
+import Data.Function
+import Data.List.NonEmpty qualified as NE
+import Data.Map qualified as M
+import Data.Maybe
+import Data.Text qualified as T
+import Data.Time.Clock
+import Data.Time.LocalTime
+
+import Caliper.Syntax.Ast
+
+data TagPredicate
+  = HasKeyValue T.Text T.Text
+  | Negate TagPredicate
+
+applyTagPredicate :: TagPredicate -> M.Map T.Text (NE.NonEmpty T.Text) -> Bool
+applyTagPredicate (HasKeyValue k v) = maybe False (v `elem`) . M.lookup k
+applyTagPredicate (Negate f) = not . applyTagPredicate f
+
+sumDuration :: (Foldable f, Functor f) => f ResolvedEntry -> NominalDiffTime
+sumDuration = sum . fmap entrySpan
+
+filterByTags :: [TagPredicate] -> [ResolvedEntry] -> [ResolvedEntry]
+filterByTags = foldr ((.) . filterByTag) id
+
+filterByTag :: TagPredicate -> [ResolvedEntry] -> [ResolvedEntry]
+filterByTag p = filter (applyTagPredicate p . entryMetadata)
+
+{- | Precondition: input entries must be sorted in ascending order in absolute time
+We group by perceived day, that is, the local day experienced in a given timezone
+-}
+groupEntriesByDay :: [ResolvedEntry] -> [NE.NonEmpty ResolvedEntry]
+groupEntriesByDay = NE.groupBy ((==) `on` localDay . zonedTimeToLocalTime . entryStart)
+
+entriesAfter :: LocalTime -> [ResolvedEntry] -> [ResolvedEntry]
+entriesAfter thres = mapMaybe $ \e ->
+  let ZonedTime l tz = entryStart e
+      e' = e {entryStart = ZonedTime (max l thres) tz}
+  in  if entrySpan e' > 0 then Just e' else Nothing
+
+entriesBefore :: LocalTime -> [ResolvedEntry] -> [ResolvedEntry]
+entriesBefore thres = mapMaybe $ \e ->
+  let ZonedTime l tz = entryEnd e
+      e' = e {entryEnd = ZonedTime (min l thres) tz}
+  in  if entrySpan e' > 0 then Just e' else Nothing
diff --git a/test/Data/TreeDiff/Instances/Caliper.hs b/test/Data/TreeDiff/Instances/Caliper.hs
new file mode 100644
--- /dev/null
+++ b/test/Data/TreeDiff/Instances/Caliper.hs
@@ -0,0 +1,22 @@
+{-# OPTIONS_GHC -Wno-orphans #-}
+
+module Data.TreeDiff.Instances.Caliper where
+
+import Data.Time.Clock
+import Data.Time.LocalTime
+import Data.TreeDiff
+
+import Caliper.Syntax
+
+instance ToExpr SrcPosition
+instance ToExpr SrcSpan
+instance ToExpr EntriesOrTZ
+instance ToExpr RawAst
+instance ToExpr RawEntry
+instance ToExpr ResolvedEntry
+instance ToExpr NominalDiffTime where toExpr = defaultExprViaShow
+instance ToExpr ResolutionError
+instance ToExpr ResolutionErrorKind
+instance ToExpr TimeZone where toExpr = defaultExprViaShow
+instance ToExpr LocalTime where toExpr = defaultExprViaShow
+instance ToExpr ZonedTime where toExpr = defaultExprViaShow
diff --git a/test/Main.hs b/test/Main.hs
new file mode 100644
--- /dev/null
+++ b/test/Main.hs
@@ -0,0 +1,181 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE ViewPatterns #-}
+
+module Main where
+
+import Data.TreeDiff
+import Data.TreeDiff.Golden
+import Data.TreeDiff.Instances.Caliper ()
+import Data.Void
+import System.FilePath
+import Test.Tasty
+import Test.Tasty.Golden.Advanced
+
+import Data.Text qualified as T
+import Data.Text.IO qualified as TIO
+import Data.Time.LocalTime
+import Text.Megaparsec
+
+import Caliper.Cli
+import Caliper.Syntax
+
+main :: IO ()
+main = defaultMain tests
+
+type ParseResult = Either (ParseErrorBundle T.Text Void)
+
+tests :: TestTree
+tests =
+  testGroup
+    "Tests"
+    [ parserTests
+    , resolutionTests
+    , queryTests
+    , histogramTests
+    ]
+
+parserTests :: TestTree
+parserTests =
+  testGroup
+    "Parser"
+    [ parserTestOk "ok_001" "ok_001.clp"
+    , parserTestOk "ok_002" "ok_002.clp"
+    , parserTestOk "ok_003" "ok_003.clp"
+    , parserTestOk "ok_004" "ok_004.clp"
+    , parserTestOk "ok_005" "ok_005.clp"
+    , parserTestOk "ok_006" "ok_006.clp"
+    , parserTestOk "ok_007" "ok_007.clp"
+    , parserTestOk "ok_008" "ok_008.clp"
+    , parserTestOk "ok_009" "ok_009.clp"
+    , parserTestOk "ok_010" "ok_010.clp"
+    , parserTestOk "ok_012" "ok_012.clp"
+    , rawParserTestErr "err_003" "err_003.clp"
+    , rawParserTestErr "err_005" "err_005.clp"
+    , parserTestOk "ok_013" "ok_013.clp"
+    , parserTestOk "ok_014" "ok_014.clp"
+    , rawParserTestOk "ok_014_raw" "ok_014.clp"
+    , parserTestOk "ok_015" "ok_015.clp"
+    ]
+
+-- Doesn't resolve
+rawParserTestOk :: String -> FilePath -> TestTree
+rawParserTestOk name fp = mkGoldenTestOk (\_src -> pure) name ("parser" </> fp)
+
+rawParserTestErr :: String -> FilePath -> TestTree
+rawParserTestErr name fp = mkGoldenTestErr name ("parser" </> fp)
+
+-- Resolves
+parserTestOk :: String -> FilePath -> TestTree
+parserTestOk name fp = mkGoldenTestOk (\_src -> pure . resolve) name ("parser" </> fp)
+
+resolutionTests :: TestTree
+resolutionTests =
+  testGroup
+    "Resolution"
+    [ resolveTestErr "err_001" "err_001.clp"
+    , resolveTestErr "err_002" "err_002.clp"
+    , resolveTestErr "err_004" "err_004.clp"
+    ]
+
+-- Parses but shouldn't resolve because of semantic errors
+resolveTestErr :: String -> FilePath -> TestTree
+resolveTestErr name fp = mkGoldenTestOk resolveShouldError name ("parser" </> fp)
+  where
+    resolveShouldError :: T.Text -> RawAst -> IO T.Text
+    resolveShouldError src (resolve -> (errs, _)) = pure $ mconcat $ map (resolutionErrorPretty src) errs
+
+histogramTests :: TestTree
+histogramTests =
+  testGroup
+    "histogram"
+    [ histogramTest groupEntriesByDay "001_groupByDay" "001.clp"
+    , histogramTest (fmap histogramLine . groupEntriesByDay) "001_groupByDay_cli" "001.clp"
+    ]
+
+histogramTest
+  :: ToExpr expr
+  => ([ResolvedEntry] -> expr)
+  -> String
+  -> FilePath
+  -> TestTree
+histogramTest f name fp = mkGoldenTestOk (\_src -> pure . fmap f . resolve) name ("histogram" </> fp)
+
+queryTests :: TestTree
+queryTests =
+  testGroup
+    "Query"
+    [ queryTest [HasKeyValue "foo" "bar"] "001_foobar" "001.clp"
+    , queryTest [Negate $ HasKeyValue "foo" "bar"] "001_notfoobar" "001.clp"
+    , beforeFilterTest (read "2025-10-02 22:59:06") "001_before_complete" "001.clp"
+    , beforeFilterTest (read "2025-10-02 22:59:55") "001_before_truncate" "001.clp"
+    , afterFilterTest (read "2025-10-02 22:59:06") "001_after_complete" "001.clp"
+    , afterFilterTest (read "2025-10-02 22:59:55") "001_after_truncate" "001.clp"
+    , beforeFilterTest (read "2025-10-02 22:59:06") "002_before_complete" "002.clp"
+    , beforeFilterTest (read "2025-10-02 22:59:55") "002_before_truncate" "002.clp"
+    , afterFilterTest (read "2025-10-02 22:59:06") "002_after_complete" "002.clp"
+    , afterFilterTest (read "2025-10-02 22:59:55") "002_after_truncate" "002.clp"
+    ]
+
+queryTest :: [TagPredicate] -> String -> FilePath -> TestTree
+queryTest filters name fp =
+  mkGoldenTestOk
+    (\_src -> pure . fmap (filterByTags filters) . resolve)
+    name
+    ("query" </> fp)
+
+beforeFilterTest :: LocalTime -> String -> FilePath -> TestTree
+beforeFilterTest thres name fp =
+  mkGoldenTestOk
+    (\_src -> pure . fmap (entriesBefore thres) . resolve)
+    name
+    ("query" </> fp)
+
+afterFilterTest :: LocalTime -> String -> FilePath -> TestTree
+afterFilterTest thres name fp =
+  mkGoldenTestOk
+    (\_src -> pure . fmap (entriesAfter thres) . resolve)
+    name
+    ("query" </> fp)
+
+parsedRight :: IO (ParseResult a) -> IO a
+parsedRight x =
+  x >>= \case
+    Left err -> fail $ errorBundlePretty err
+    Right ok -> pure ok
+
+mkGoldenTestOk
+  :: ToExpr expr
+  => (T.Text -> RawAst -> IO expr)
+  -> String
+  -> FilePath
+  -> TestTree
+mkGoldenTestOk f = mkGoldenTest $ \src -> \case
+  Right output -> do
+    output' <- f src output
+    pure $ toExpr output'
+  Left err -> fail $ errorBundlePretty err
+
+mkGoldenTestErr :: String -> FilePath -> TestTree
+mkGoldenTestErr = mkGoldenTest $ \_src -> \case
+  Right output -> fail $ "Unexpected success:\n" <> show output
+  Left err -> pure $ errorBundlePretty err
+
+mkGoldenTest
+  :: (Eq expr, ToExpr expr)
+  => ( forall s e
+        . (VisualStream s, TraversableStream s, ShowErrorComponent e)
+       => T.Text
+       -> Either (ParseErrorBundle s e) RawAst
+       -> IO expr
+     )
+  -- ^ handle the parse result
+  -> String
+  -> FilePath
+  -> TestTree
+mkGoldenTest f name fname =
+  ediffGolden goldenTest name outFilePath $ do
+    content <- TIO.readFile inFilePath
+    f content $ runParser caliperAst inFilePath content
+  where
+    inFilePath = "test" </> "data" </> fname
+    outFilePath = inFilePath `replaceFileName` name `addExtension` ".expr"
diff --git a/test/data/histogram/001.clp b/test/data/histogram/001.clp
new file mode 100644
--- /dev/null
+++ b/test/data/histogram/001.clp
@@ -0,0 +1,6 @@
+0000-01-01 00:00:00 ... 0000-01-01 00:14:00 -- .
+0000-01-02 00:00:00 ... 0000-01-02 00:15:00 -- +
+0000-01-03 00:00:00 ... 0000-01-03 02:00:00 -- 2 $
+
+0000-01-04 00:00:00 ... 0000-01-04 02:14:00 -- 2 $ .
+0000-01-05 00:00:00 ... 0000-01-05 02:15:00 -- 2 $ +
diff --git a/test/data/histogram/001_groupByDay.expr b/test/data/histogram/001_groupByDay.expr
new file mode 100644
--- /dev/null
+++ b/test/data/histogram/001_groupByDay.expr
@@ -0,0 +1,48 @@
+_×_
+  []
+  [
+    NE.fromList
+      [
+        ResolvedEntry {
+          entryStart =
+          `0000-01-01 00:00:00 UTC`,
+          entryEnd =
+          `0000-01-01 00:14:00 UTC`,
+          entryMetadata = Map.fromList
+            []}],
+    NE.fromList
+      [
+        ResolvedEntry {
+          entryStart =
+          `0000-01-02 00:00:00 UTC`,
+          entryEnd =
+          `0000-01-02 00:15:00 UTC`,
+          entryMetadata = Map.fromList
+            []}],
+    NE.fromList
+      [
+        ResolvedEntry {
+          entryStart =
+          `0000-01-03 00:00:00 UTC`,
+          entryEnd =
+          `0000-01-03 02:00:00 UTC`,
+          entryMetadata = Map.fromList
+            []}],
+    NE.fromList
+      [
+        ResolvedEntry {
+          entryStart =
+          `0000-01-04 00:00:00 UTC`,
+          entryEnd =
+          `0000-01-04 02:14:00 UTC`,
+          entryMetadata = Map.fromList
+            []}],
+    NE.fromList
+      [
+        ResolvedEntry {
+          entryStart =
+          `0000-01-05 00:00:00 UTC`,
+          entryEnd =
+          `0000-01-05 02:15:00 UTC`,
+          entryMetadata = Map.fromList
+            []}]]
diff --git a/test/data/histogram/001_groupByDay_cli.expr b/test/data/histogram/001_groupByDay_cli.expr
new file mode 100644
--- /dev/null
+++ b/test/data/histogram/001_groupByDay_cli.expr
@@ -0,0 +1,8 @@
+_×_
+  []
+  [
+    "0000-01-01 UTC | .",
+    "0000-01-02 UTC | +",
+    "0000-01-03 UTC | +++$+++$",
+    "0000-01-04 UTC | +++$+++$.",
+    "0000-01-05 UTC | +++$+++$+"]
diff --git a/test/data/parser/err_001.clp b/test/data/parser/err_001.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_001.clp
@@ -0,0 +1,3 @@
+
+-- This has a duration of 0
+2025-10-02 22:59:05 ... 2025-10-02 22:59:05
diff --git a/test/data/parser/err_001.expr b/test/data/parser/err_001.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_001.expr
@@ -0,0 +1,8 @@
+T.concat
+  [
+    "user error: Timespan has negative or null duration of 0s\n",
+    "test/data/parser/err_001.clp:3:\n",
+    "  | -- This has a duration of 0\n",
+    "3 | 2025-10-02 22:59:05 ... 2025-10-02 22:59:05\n",
+    "  |                         ^^^^^^^^^^^^^^^^^^^\n",
+    "  | \n"]
diff --git a/test/data/parser/err_002.clp b/test/data/parser/err_002.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_002.clp
@@ -0,0 +1,6 @@
+type foo
+type bar
+
+-- This type is not declared
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+  type:baz
diff --git a/test/data/parser/err_002.expr b/test/data/parser/err_002.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_002.expr
@@ -0,0 +1,8 @@
+T.concat
+  [
+    "user error: event has undeclared type \"baz\"\n",
+    "test/data/parser/err_002.clp:6:\n",
+    "  | 2025-10-02 22:59:05 ... 2025-10-02 22:59:06\n",
+    "6 |   type:baz\n",
+    "  |   ^^^^^^^^\n",
+    "  | \n"]
diff --git a/test/data/parser/err_003.clp b/test/data/parser/err_003.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_003.clp
@@ -0,0 +1,5 @@
+-- invalid end date
+2025-10-02 22:59:05 ... 2025-10-00 22:59:06
+
+-- invalid start date
+2025-10-00 22:59:05 ... 2025-10-01 22:59:06
diff --git a/test/data/parser/err_003.expr b/test/data/parser/err_003.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_003.expr
@@ -0,0 +1,7 @@
+concat
+  [
+    "test/data/parser/err_003.clp:2:25:\n",
+    "  |\n",
+    "2 | 2025-10-02 22:59:05 ... 2025-10-00 22:59:06\n",
+    "  |                         ^\n",
+    "unexpected invalid calendar date\n"]
diff --git a/test/data/parser/err_004.clp b/test/data/parser/err_004.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_004.clp
@@ -0,0 +1,3 @@
+2025-10-02 22:59:05 ... 2025-10-02 22:59:08
+  type:foo
+  type:bar
diff --git a/test/data/parser/err_004.expr b/test/data/parser/err_004.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_004.expr
@@ -0,0 +1,8 @@
+T.concat
+  [
+    "user error: event has duplicate types \"bar\" while it already bears the type \"foo\"\n",
+    "test/data/parser/err_004.clp:3:\n",
+    "  |   type:foo\n",
+    "3 |   type:bar\n",
+    "  |   ^^^^^^^^\n",
+    "  | \n"]
diff --git a/test/data/parser/err_005.clp b/test/data/parser/err_005.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_005.clp
@@ -0,0 +1,3 @@
+
+-- Valid number but leading 0, doesn't fit in the grammar
+2025-10-02 22:59:05 ... 2025-10-02 022:59:05
diff --git a/test/data/parser/err_005.expr b/test/data/parser/err_005.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/err_005.expr
@@ -0,0 +1,8 @@
+concat
+  [
+    "test/data/parser/err_005.clp:3:38:\n",
+    "  |\n",
+    "3 | 2025-10-02 22:59:05 ... 2025-10-02 022:59:05\n",
+    "  |                                      ^\n",
+    "unexpected '2'\n",
+    "expecting non-digit separator\n"]
diff --git a/test/data/parser/ok_001.clp b/test/data/parser/ok_001.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_001.clp
@@ -0,0 +1,1 @@
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
diff --git a/test/data/parser/ok_001.expr b/test/data/parser/ok_001.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_001.expr
@@ -0,0 +1,10 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/parser/ok_002.clp b/test/data/parser/ok_002.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_002.clp
@@ -0,0 +1,2 @@
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
diff --git a/test/data/parser/ok_002.expr b/test/data/parser/ok_002.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_002.expr
@@ -0,0 +1,17 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/parser/ok_003.clp b/test/data/parser/ok_003.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_003.clp
@@ -0,0 +1,5 @@
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
diff --git a/test/data/parser/ok_003.expr b/test/data/parser/ok_003.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_003.expr
@@ -0,0 +1,17 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/parser/ok_004.clp b/test/data/parser/ok_004.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_004.clp
@@ -0,0 +1,7 @@
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+-- This is a comment
+
diff --git a/test/data/parser/ok_004.expr b/test/data/parser/ok_004.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_004.expr
@@ -0,0 +1,17 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/parser/ok_005.clp b/test/data/parser/ok_005.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_005.clp
@@ -0,0 +1,14 @@
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+  -- a inner comment
+   -- I can mess up the indent as long it's indented
+-- another inner comment
+  foo:bar
+-- foo
+  bar:baz
+
+
+-- This is a comment
+
diff --git a/test/data/parser/ok_005.expr b/test/data/parser/ok_005.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_005.expr
@@ -0,0 +1,21 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/parser/ok_006.clp b/test/data/parser/ok_006.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_006.clp
@@ -0,0 +1,13 @@
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+  -- a inner comment
+   -- I can mess up the indent as long it's indented
+  -- another inner comment
+  foo:bar
+  bar:baz
+
+
+-- This is a comment
+
diff --git a/test/data/parser/ok_006.expr b/test/data/parser/ok_006.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_006.expr
@@ -0,0 +1,21 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/parser/ok_007.clp b/test/data/parser/ok_007.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_007.clp
@@ -0,0 +1,18 @@
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+  {-
+    this is a multiline comment
+    this can be useful for long paragraphs -}
+
+  {-
+    it can end on the same line of the inner document or not
+
+  -}
+  foo:bar
+  bar:baz
+
+
+-- This is a comment
+
diff --git a/test/data/parser/ok_007.expr b/test/data/parser/ok_007.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_007.expr
@@ -0,0 +1,21 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/parser/ok_008.clp b/test/data/parser/ok_008.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_008.clp
@@ -0,0 +1,25 @@
+2025-10-08 16:51:19 ... 2025-10-08 18:48:49
+  -- fixed Comment being nested inside
+  --
+  -- foo
+
+2025-10-09 10:18:13 {-
+  multiline comment where space is allowed
+  -} ... 2025-10-09 11:25:57 {-
+    - [ ] make all parser tests pass
+      - [ ] test braces
+        - [ ] ask hecate where to find brace layout examples
+      - [ ] fix roundtrip tests
+  -}
+
+
+2025-10-09 10:18:13 {- comment anywhere space is allowed -} ... 2025-10-09 11:25:57 {-
+    - [ ] make all parser tests pass
+      - [ ] test braces
+        - [ ] ask hecate where to find brace layout examples
+      - [ ] fix roundtrip tests
+  -}
+  foo:bar
+  -- comment
+  bar:baz
+  -- after comment
diff --git a/test/data/parser/ok_008.expr b/test/data/parser/ok_008.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_008.expr
@@ -0,0 +1,28 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-08 16:51:19 UTC`,
+      entryEnd =
+      `2025-10-08 18:48:49 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-09 10:18:13 UTC`,
+      entryEnd =
+      `2025-10-09 11:25:57 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-09 10:18:13 UTC`,
+      entryEnd =
+      `2025-10-09 11:25:57 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/parser/ok_009.clp b/test/data/parser/ok_009.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_009.clp
@@ -0,0 +1,1 @@
+2025-10-02 22:58:05 ... 2025-10-02 22:59:__
diff --git a/test/data/parser/ok_009.expr b/test/data/parser/ok_009.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_009.expr
@@ -0,0 +1,10 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:58:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:00 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/parser/ok_010.clp b/test/data/parser/ok_010.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_010.clp
@@ -0,0 +1,27 @@
+2025-10-08 16:51:19 ... 2025-10-08 18:48:49
+
+-- leading comment in metadata
+-- fixed Comment being nested inside
+  --
+  -- foo
+
+2025-10-09 10:18:13 {-
+  multiline comment where space is allowed
+  -} ... 2025-10-09 11:25:57 {-
+    - [ ] make all parser tests pass
+      - [ ] test braces
+        - [ ] ask hecate where to find brace layout examples
+      - [ ] fix roundtrip tests
+  -} -- following trailing line comment
+
+
+2025-10-09 10:18:13 {- comment anywhere space is allowed -} ... 2025-10-09 11:25:57 {-
+    - [ ] make all parser tests pass
+      - [ ] test braces
+        - [ ] ask hecate where to find brace layout examples
+      - [ ] fix roundtrip tests
+  -}
+  foo:bar
+  -- comment
+  bar:baz
+  -- after comment
diff --git a/test/data/parser/ok_010.expr b/test/data/parser/ok_010.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_010.expr
@@ -0,0 +1,28 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-08 16:51:19 UTC`,
+      entryEnd =
+      `2025-10-08 18:48:49 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-09 10:18:13 UTC`,
+      entryEnd =
+      `2025-10-09 11:25:57 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-09 10:18:13 UTC`,
+      entryEnd =
+      `2025-10-09 11:25:57 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/parser/ok_012.clp b/test/data/parser/ok_012.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_012.clp
@@ -0,0 +1,5 @@
+   
+type foo
+
+type bar
+
diff --git a/test/data/parser/ok_012.expr b/test/data/parser/ok_012.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_012.expr
@@ -0,0 +1,1 @@
+_×_ [] []
diff --git a/test/data/parser/ok_013.clp b/test/data/parser/ok_013.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_013.clp
@@ -0,0 +1,21 @@
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+{-
+A comment
+
+{-
+
+A comment in a comment
+
+{-
+
+Can we go deeper?
+
+-}
+
+
+-}
+
+-}
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
diff --git a/test/data/parser/ok_013.expr b/test/data/parser/ok_013.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_013.expr
@@ -0,0 +1,17 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/parser/ok_014.clp b/test/data/parser/ok_014.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_014.clp
@@ -0,0 +1,3 @@
+
+timezone +2:00
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
diff --git a/test/data/parser/ok_014.expr b/test/data/parser/ok_014.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_014.expr
@@ -0,0 +1,10 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 +0200`,
+      entryEnd =
+      `2025-10-02 22:59:06 +0200`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/parser/ok_014_raw.expr b/test/data/parser/ok_014_raw.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_014_raw.expr
@@ -0,0 +1,19 @@
+RawAst {
+  rawAstCurrentFilePath =
+  "test/data/parser/ok_014.clp",
+  rawAstTypeDecls = [],
+  rawAstEntriesOrTZ = [
+    TZDecl `+0200`,
+    RawEntries
+      [
+        RawEntry {
+          rawEntryStart =
+          `2025-10-02 22:59:05`,
+          rawEntryEnd = _×_
+            `2025-10-02 22:59:06`
+            (SrcSpan
+              "test/data/parser/ok_014.clp"
+              (SrcPosition 3 25)
+              (SrcPosition 3 44)),
+          rawEntryMetadata = Map.fromList
+            []}]]}
diff --git a/test/data/parser/ok_015.clp b/test/data/parser/ok_015.clp
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_015.clp
@@ -0,0 +1,11 @@
+
+timezone +2:00
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+-- Timezone change
+-- Same local time but in a later time zone, so +8:00 happened first
+
+timezone +8:00
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
+
+2025-10-02 22:59:05 ... 2025-10-02 22:59:06
diff --git a/test/data/parser/ok_015.expr b/test/data/parser/ok_015.expr
new file mode 100644
--- /dev/null
+++ b/test/data/parser/ok_015.expr
@@ -0,0 +1,24 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 +0800`,
+      entryEnd =
+      `2025-10-02 22:59:06 +0800`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 +0800`,
+      entryEnd =
+      `2025-10-02 22:59:06 +0800`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:05 +0200`,
+      entryEnd =
+      `2025-10-02 22:59:06 +0200`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/query/001.clp b/test/data/query/001.clp
new file mode 100644
--- /dev/null
+++ b/test/data/query/001.clp
@@ -0,0 +1,13 @@
+
+2025-10-02 22:58:05 ... 2025-10-02 22:59:06
+
+2025-10-02 22:59:50 ... 2025-10-02 23:05:00
+  -- a inner comment
+   -- I can mess up the indent as long it's indented
+  -- another inner comment
+  foo:bar
+  bar:baz
+
+
+-- This is a comment
+
diff --git a/test/data/query/001_after_complete.expr b/test/data/query/001_after_complete.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/001_after_complete.expr
@@ -0,0 +1,14 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:50 UTC`,
+      entryEnd =
+      `2025-10-02 23:05:00 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/query/001_after_truncate.expr b/test/data/query/001_after_truncate.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/001_after_truncate.expr
@@ -0,0 +1,14 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:55 UTC`,
+      entryEnd =
+      `2025-10-02 23:05:00 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/query/001_before_complete.expr b/test/data/query/001_before_complete.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/001_before_complete.expr
@@ -0,0 +1,10 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:58:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/query/001_before_truncate.expr b/test/data/query/001_before_truncate.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/001_before_truncate.expr
@@ -0,0 +1,21 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:58:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:50 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:55 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/query/001_foobar.expr b/test/data/query/001_foobar.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/001_foobar.expr
@@ -0,0 +1,14 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:50 UTC`,
+      entryEnd =
+      `2025-10-02 23:05:00 UTC`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/query/001_notfoobar.expr b/test/data/query/001_notfoobar.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/001_notfoobar.expr
@@ -0,0 +1,10 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:58:05 UTC`,
+      entryEnd =
+      `2025-10-02 22:59:06 UTC`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/query/002.clp b/test/data/query/002.clp
new file mode 100644
--- /dev/null
+++ b/test/data/query/002.clp
@@ -0,0 +1,16 @@
+
+timezone +08:00
+
+2025-10-02 22:58:05 ... 2025-10-02 22:59:06
+
+timezone +02:00
+2025-10-02 22:59:50 ... 2025-10-02 23:05:00
+  -- a inner comment
+   -- I can mess up the indent as long it's indented
+  -- another inner comment
+  foo:bar
+  bar:baz
+
+
+-- This is a comment
+
diff --git a/test/data/query/002_after_complete.expr b/test/data/query/002_after_complete.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/002_after_complete.expr
@@ -0,0 +1,14 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:50 +0200`,
+      entryEnd =
+      `2025-10-02 23:05:00 +0200`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/query/002_after_truncate.expr b/test/data/query/002_after_truncate.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/002_after_truncate.expr
@@ -0,0 +1,14 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:55 +0200`,
+      entryEnd =
+      `2025-10-02 23:05:00 +0200`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
diff --git a/test/data/query/002_before_complete.expr b/test/data/query/002_before_complete.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/002_before_complete.expr
@@ -0,0 +1,10 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:58:05 +0800`,
+      entryEnd =
+      `2025-10-02 22:59:06 +0800`,
+      entryMetadata = Map.fromList
+        []}]
diff --git a/test/data/query/002_before_truncate.expr b/test/data/query/002_before_truncate.expr
new file mode 100644
--- /dev/null
+++ b/test/data/query/002_before_truncate.expr
@@ -0,0 +1,21 @@
+_×_
+  []
+  [
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:58:05 +0800`,
+      entryEnd =
+      `2025-10-02 22:59:06 +0800`,
+      entryMetadata = Map.fromList
+        []},
+    ResolvedEntry {
+      entryStart =
+      `2025-10-02 22:59:50 +0200`,
+      entryEnd =
+      `2025-10-02 22:59:55 +0200`,
+      entryMetadata = Map.fromList
+        [
+          _×_ "bar" (NE.fromList ["baz"]),
+          _×_
+            "foo"
+            (NE.fromList ["bar"])]}]
