fix(parsing): remove shared scratch tables; parse fully in PHP (#247)

db/migrations/20260702_120000_drop_persistent_scratch_tables.sql

@@ -0,0 +1,21 @@
+-- Migration: Drop the persistent parse/import scratch tables.
+--
+-- temp_word_occurrences, temp_words and tempexprs used to be persistent,
+-- globally-shared InnoDB tables that every parse/import TRUNCATEd and refilled.
+-- That caused two problems:
+--   * "Tablespace is missing for a table" (InnoDB error 194) crashes on
+--     TRUNCATE when the table's .ibd file went missing (notably on Windows) —
+--     every text import then failed. See issue #247.
+--   * Concurrent parses/imports corrupted each other's rows (no isolation).
+--
+-- They are now created per database connection as CREATE TEMPORARY TABLE at
+-- runtime (see src/Shared/Infrastructure/Database/ScratchTables.php), so the
+-- persistent versions are no longer needed. Dropping them here also repairs
+-- installs whose tablespace was already orphaned (the reported crash).
+--
+-- DROP TABLE IF EXISTS is idempotent and succeeds even when the tablespace is
+-- missing, so it clears the orphaned dictionary entry as well.
+
+DROP TABLE IF EXISTS temp_word_occurrences;
+DROP TABLE IF EXISTS temp_words;
+DROP TABLE IF EXISTS tempexprs;

db/schema/baseline.sql

@@ -112,23 +112,12 @@ CREATE TABLE IF NOT EXISTS word_occurrences (
 )
 ENGINE=InnoDB DEFAULT CHARSET=utf8;
 
-CREATE TABLE IF NOT EXISTS temp_word_occurrences (
-    TiCount smallint(5) unsigned NOT NULL,
-    TiSeID mediumint(8) unsigned NOT NULL,
-    TiOrder smallint(5) unsigned NOT NULL,
-    TiWordCount tinyint(3) unsigned NOT NULL,
-    TiText varchar(250) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
-
-CREATE TABLE IF NOT EXISTS temp_words (
-    WoText varchar(250) DEFAULT NULL,
-    WoTextLC varchar(250) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL,
-    WoTranslation varchar(500) NOT NULL DEFAULT '*',
-    WoRomanization varchar(100) DEFAULT NULL,
-    WoSentence varchar(1000) DEFAULT NULL,
-    WoTaglist varchar(255) DEFAULT NULL,
-    PRIMARY KEY(WoTextLC)
-) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+-- The parse/import scratch tables (temp_word_occurrences, temp_words, tempexprs)
+-- are no longer persistent shared tables. They are created per database
+-- connection as CREATE TEMPORARY TABLE at runtime (see
+-- src/Shared/Infrastructure/Database/ScratchTables.php). This avoids InnoDB
+-- "Tablespace is missing" (error 194) crashes on TRUNCATE and isolates
+-- concurrent parses/imports from each other. See issue #247.
 
 CREATE TABLE IF NOT EXISTS texts (
     TxID smallint(5) unsigned NOT NULL AUTO_INCREMENT,